Eaton's. 
Formally incoprerated on December 8, 1869 as the Timothy Eaton Company, Ltd. but traded mostly as Eaton's, this company was Canada's largest mail order outlet and later also became a chain of department stores. The company used their own Viking brandname for CE products and for a long time had a close relationship with the Electrohome company which was their main OEM provider of such products, interestingly unlike their USA based rival Sears which very much focused on cheap products with their own brands, much of the Eaton's Brown Goods range were real quality stuff and priced above average in the marketplace. Ironically enough the company went bankrupt in the 1990's and were bough by Sears and in fact that company has let the Eaton brand lapse into obscurity to a degree and has slowly been renaming the old Eaton stores as Sears, they have also licensed the Viking brand to companies such as Viking Range but the brand is no longer connected to the audio industry. Official homepage.
Eben (Firma Ing. Franz Eben)
German electronics manufacturer based in Dachau, manufactured tape recorders from the late 50's until the latter half of the 60's mostly as an OEM but later also sold transcription equipment, telephones and answering machines, etc. The company still exists in the form of Eben-Elektronik GmbH but has long since left the audio business and is currently situated in Petershausen. Official homepage.
EbEn Acoustic Lab
Manufacturer of hand crafted loudspeakers for home audio and theatre usage based in San Francisco, USA. Also unusually enough offered speaker systems for musicians that were technically more similar to high end hi-fi models than the usual PA stuff. All contact with this company was lost in early 2002. Not to be confused with Danish high end loudspeaker manufacturer Raidho that trades under the EbEn name.
EICO See --> EICO
Eldeen Manufacturing Corporation
USA based manufacturer of phonographic stylii, taken over by Recoton in 1952.
Electra Co.
USA based manufacturer of arcade machines, did in the 1930's manufacture coin operated radio-gramophones that where a kind of precursor to the jukebox. Started out in the 1890's and was operation into the early 1940's at the least.
Electra Radio Corporation
Japanese company that manufactured mostly radios and similar communications equipment primarily for the semi-pro market, but did for a while also make consumer products such as portable radio receivers and tape recorders and on a smaller scale music centres. Timeline is unknown but appears to be roughly late 50's to mid 70's. Note that there was an unconnected USA based company called Electra Radio Inc. that appears to have been a store rather than a manufaturer.
Electrohome
Originally started in Kitchener in the province of Ontario, Canada in the spring of 1907, by Arthur B. Pollock and Alex Welker as Dominion Electrohome Industries Limited to manufacture Gramophones and entered the radio manufacturing business in the 1920's, initially testing the waters by using the guise of Grimes Radio Corporation. Company was active in the white and brown goods markets from then on and up to the 1980's, although some AV and communication equipment was sold with this brand name right up to the year 2000, those were all rebranded Japanese and Asian products, mostly Mitshubishi. The company still exists as a holding company but is no longer active in the consumer market. The company was for a long while Canada's biggest manufacturer of Brown Goods and as such manufactured audio products that were sold under other brands such as Viking that was owned by Eaton's. Company's name was sometimes shortened to DEIL, their furniture workshop traded as Deilcraft for instance. The brand name is has been licensed to a company called Jutan International Ltd. (JIL) since 1999 and any queries about equipment bought since then should be referred to that company. Official homepage.
Elektro Akustik
Small Swedish maker of high quality audio kits such as valve amps etc., timeline ca latter half of the 90's to 2003.
Electromophon AG
Grammophone manufacturer based in Stuttgart-Vaihingen in Germany, formed I believe in the 1910's (accounts differ on the exact year) and took over Albert Ebner & Co. in 1921 which gave them an access to electric motor technology. The company was unusual in it's day since it specialised in producing high priced standalone gramophones, in other words it was one of the first high end audio companies out there, it failed sometime in the depression probably in 1930 since the last models I have seen from them are from 1929. A picture of one of their models from 1929 can be found here at an Austrian radio museum and a slightly earlier model here (scroll down to the middle of the page)..
Electronic Instrument Company (EICO). 
Based in New York, USA and started in 1945 to manufacture electronic test equipment in kit form but later in that decade started offering their products as fully built. Test equipment remained the company's mainstay during the whole time it was in the electronics business but EICO augmented their product lines what was fashionable at each time as for instance in the late 40's it partook in the Geiger counter fad that was for a short time all the rage in the USA when people wanted to get rich on finding uranium deposits just like what fuelled the metal detector fad in England 3 decades later, in the 50's and 60's they offered ham radio equipment and in the 80's electronic security equipment, but their biggest secondary market was audio equipment. They appear to have started producing hi-fi products in the early 50's with a line of tuners and amplifiers, these where available both in a kit form or fully built, early models where not considered very good but models produced in the late 50's and early 60's where amongst the better offered at the time, in particular their loudspeakers and valve amplifiers but the company had hired freelance designers to design some of those. In the latter half of the 60's EICO introduced a line of solid state audio equipment referred to as Cortina's but in the 70's the only audio products they sold where kits made for them in South Korea and EICO exited the audio market in the late 1970's and the electronics market altogether a little later but existed as a property management company until 1999 the company was liquidated apparently at the request of the shareholders rather than due to bankruptcy procedure (EICO was a NASDAQ listed company BTW). There is a mailing list on Yahoo that discusses EICO valve amplifiers.
Elektrotechnische Fabrik Ing. Ludwig Neumann GmbH (Ingelen)
Austrian company based in Wien (Vienna), was founded in 1907 as a porcelain workshop, started making passive electronic components in 1924 with the introduction of an innovative porcelain loudspeaker (that was actually sold under the Hornyphon brand), and commenced the manufacture of radios in 1926, the anme of the company was changed to Radiofabrik Ingelen Figer & Co KG after WWII and was taken over by C. Lorenz in 1966 and continued as one of their main hi-fi & radio manufacturing plant but the Ingelen trademark was only used on their products in Austria and for some reason on a few of their top of the line hi-fi products in the rest of the world. Use of the trademark was discontinued in 1988 and the factory itself closed, a year after it had bought out by Nokia, the trademark has since then been used by HB Austria on rebadged Asian low end AV products.
Elite Gramophones
Tiny manufacturer of turntables based in Hersham, Walton-On-Thames, in Surrey, Britain. Founded in the late 70's to commercialise an unusual high end turntable/tonearm combination that was developed at the Cranfield Institute of Technology, but it appears that the company in the end only shipped the turntable in the form of the Elite Rock as no information has been found on the arm ever entering production. Changed it's name and address in the mid 80's to Elite Electronics (EEl) were in addition to making the Rock the company was also selling the Elite Electronics Pickups. Disappeared in the latter half of the 1980's and the rights to the turntable design were sold to Townshend, some of the older Elite products appear with the Elite - Townshend name.
Empire Scientific 
Started in the late 50's as Dyna-Empire Inc. and made quite a splash with the Empire turntables and loudspeaker ranges, but later became one of the biggest manufacturer of phonographic pickups. The spares and stylus supply operation was sold to Russel Lind, the pickup manufacture operation to Benz Micro and the company itself currently only assembles batteries for camcorders and mobile phones. Official homepage.
Ericsson See --> L. M. Ericsson
Erskine
English company based near Scarborough, made high end radios in the 30's, and in the late 40's and into the early 60's made tape recorders, some for consumer/professional usage, those were mostly sold under the Fi-Cord brand, but most of their intended for military use, the company still exists but exited the audio market in the late 60's. Official homepage.
Eumig 
Founded in Wien, Austria in 1919 as a manufacturer of formed metal products such as lighters etc., entered the consumer electronics market in the 30's with a line of radios and continued the manufacture of similar consumer products into the fifties but is by far best know for their 16 and 8 mm film projectors and cameras that were simply without peer. The company initially entered the audio market in the 1977 with a couple of cassette recorders that had features that were useful for movie makers, these were so successful that the company formed a hi-fi division and in 1979 introduced the 1000 line of hi-fi separates including the legendary Eumig FL-1000µP cassette recorder. Sadly the company was by then in financial trouble that came about due to their contract with the Polaroid Land company in 1974 to produce cameras and playback equipment for the ill fated Polavision system, while the hardware made by Eumig was of a high quality and therefore price, the media provided by Polaroid had lots of problems and the picture quality could only be described as abysmal and sales were therefore non-existent. Since Polaroid had provided only verbal financial guarantees to Eumig the latter company never recovered financially from this fiasco and they had to close the Hifi division in Dec. 1981 and the company went into bankruptcy in 1982. None of the companies that currently trade under this name (and logo NB.) appear to have any connection with the original company.
Euphonics
USA based company with production facilities in Puerto Rico that made tonearms and crystal/ceramic cartridges in the 50's early 60's, some quite "innovative" (or rather oddball) designs, company was gobbled up by Astatic in the early 70's and indeed they still make stylii for some of the old Euphonics pickups.
Eymann See --> Eymann
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