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Bell Labs, definitely 1932, this dovetails exactly with the Bell Labs LP notes:
http://www.stokowski.org/Harvey_Fletcher_and_Bell_Labs_Stereo.htm

So I think those lab tests with Keller and Patterson were 1932-ish, not 1934. Facts in lieu of my 
supposition most welcome!

-- Tom Fine

----- Original Message ----- 
From: "Goran Finnberg" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 26, 2012 8:02 AM
Subject: [ARSCLIST] Bell Labs and EMI early 2-channel


> Tom Fine:
>
>> Was Decca's 1950's microgroove vert-lat snip still another
>> approach or a smaller-stylus adaption of an earlier system?
>
> I consider it just another approach.
>
> Arthur Haddy, Decca studios chief technical director, has stated on numerous
> occasions that the DECCA cutterhead could make Stereo vinyl disks either
> 45/45 or vertical/lateral at the flick of a switch.
>
> The cutterhead stayed the same but the signals driving it was matrixed
> differently to either produce 45/45 or vertical/lateral when switching said
> switch.
>
> So in the end they had no problems at all to agree to the 45/45 system as a
> wordwide standard because of said switch.
>
> http://www.aes.org/aeshc/docs/jaes.obit/JAES_V38_5_PG413.pdf
>
> http://www.gramophone.net/Issue/Page/April%201990/163/734338/ARTHUR+CHARLES+
> HADDY
>
> http://www.aes.org/e-lib/browse.cfm?elib=3317
>
> The Coming of Stereo
>
> FOREWARD: The author, as Manager of Engineering RCA Victor Records, later as
> Chief Engineer, as a member of the Engineering Committee of the Record
> Industry Association (RIAA), and as Chairman of the Electronic Industries
> Association (EIA) Committee R 7 Phonograph Combinations, was heavily
> involved in the standardization of the stereophonic record. This is the
> story of his personal involvement.
>
> Author: Roys, H. E.
> JAES Volume 25 Issue 10/11 pp. 824-827; November 1977 Import into BibTeX
>
> Click to purchase paper or login as an AES member. If your company or school
> subscribes to the E-Library then switch to the institutional version. If you
> are not an AES member and would like to subscribe to the E-Library then Join
> the AES!
>
> This paper costs $20 for non-members, $5 for AES members and is free for
> E-Library subscribers.
>
> Learn more about the AES E-Library
>
> E-Library Location: (CD aes3)   /jrnl6877/1977/7532.pdf
>
>
>
> -- 
> Best regards,
>
> Goran Finnberg
> The Mastering Room AB
> Goteborg
> Sweden
>
> E-mail: [log in to unmask]
>
> Learn from the mistakes of others, you can never live long enough to
> make them all yourself.    -   John Luther
>
> (\__/)
> (='.'=)
> (")_(") Smurfen:RIP
>