[GreenKeys] AP Model 15 longevity

[Larry Tighe]

I found this on a eBay listing for a Model 14...probably from Wikipedia
Lar
=============================
  a.. 12 - 1922 - the first general purpose teletype
  b.. 14 - 1925 - about 60,000 were built
  c.. 15 - 1930 - the mainstay of U.S. military communications in WWII. 
About 200,000 were built
  d.. 20 - 1950s - upper/lower case printer machine with four rows of keys, 
using a six-bit code for TeleTypeSetter (TTS) use
  e.. 28 - 1950s - regarded as the most rugged machine Teletype ever built
  f.. 29 - 1950s - eight-bit machine using an IBM BCD code
  g.. 32/33 - 1961 - a low-cost, all-mechanical design. The 32 was Baudot, 
the 33 ASCII, but still upper case only. The 33 ASR was ubiquitous as a 
console device in the early minicomputer era
  h.. 35 - 1961 - an ASCII version of the model 28
  i.. 38 - 1970s - upper/lower case, wide carriage version of the model 33
  j.. 42/43 - 1979 - an electronic, dot-matrix printer design, 42 being 
Baudot and 43 ASCII

Subject: [GreenKeys] AP Model 15 longevity



>
> What was the end of the M-15 production by Teletype?  I can't imagine
> the AP bought out the final production run for the entire news service,
> so there must have been serial number machines in the field from much
> earlier Teletype production runs.
>
>
>
>
>
> David I. Emery wrote:
>
>>On Sun, Sep 23, 2007 at 07:22:15PM +0000, sdaitch at mor.ibb.gov wrote:
>>
>>
>>>The AP was using M-15 machines (and M-20s fpr that matter), at least
>>>in North Carolina, into 1979.  I know, I worked on them.
>>
>> Does anyone know how old those 15s and 20s were when they were
>>finally retired ?
>>
>> I know the 15 went into production some time in the very late
>>1920s or early 30s and the 20 was I think immediately post WW II (maybe
>>1950).
>>
>> Did some of those machines make 50 years of continuous service
>>(with parts replaced of course) ?
>>
>>
>>
>>
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