[GreenKeys] Model 15 serial numbers

[WA5CAB at cs.com]

FWIW, electrical and electronic equipment supplied to the Signal Corps will 
usually have the Signal Corps Order Number on the nameplate.  Signal Corps 
Order Numbers from before W-II until around 1958 or 1960 have the 2-digit US 
federal fiscal year embedded in them.  Up until 1976, the federal fiscal 
year began on 01 July of the previous calender year.  Since then, it has begun 
on 01 October.  In any case, Teletype equipment supplied to the Signal 
Corps (U.S. Army) is self dating within a year.  Unfortunately, U.S. Navy 
Contract Numbers never did this.  Note that Signal Corps orders are equivalent to 
Navy contracts.  Signal Corps contracts are not related to specific 
equipment and AFAIK there is no Navy equivalent.  In any case, Signal Corps 
equipment of the period tends to be self-dating within a year.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 01/08/2016 16:25:07 PM Central Standard Time, 
jhhaynes at earthlink.net writes: 
> Well if we had the Teletype invoices that Ed mentions we could figure it
> out because I think at least for non-military customers they would invoice
> it as a BB-something, BP something, BK something if there was a keyboard,
> BC or maybe BPC for the cover and XT something for the table.  Military
> customers might have got TG-7B or the like as a complete set.  Which might
> mean a different series of serial numbers, tho I guess the things inside
> would be individually serial numbered.
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