[GreenKeys] Model 36 printer

[Jim Haynes]

I'm certainly not authoritative on where the model numbers come from.
One thing that seems clear is that model numbers were a Bell System
thing, beginning before Teletype with the Model 10 (and there were some
W.E. models before that) and then Teletype's first numbered model was
Model 11, a tape strip printer using a type wheel.  Then the 12 page
printer, and then the 13 was a combination of the page printer from the
Model 12 and the tape equipment from the Model 10.  The Model 10 printer
was very costly to make, so this was a way to save the good parts of
the Model 10 without incurring the cost of the printer.

This is purely speculative, but maybe the Model 36 was originally made
without a numbered model as the Bell System was not interested in
offering it, and then some Bell company thought they might be able to
lease some and it was given a model number at that time.

Internally Teletype used letter codes instead of model numbers.  Thus all
the Model 28/35 equipment has LK for the keyboard, LAK for the ASR 
keyboard, LP for the printer, LESU for the electrical service unit,
LPR for the reperforator, etc.  These codes jump around.  Model 14 stuff
is all F, which someone rumored came from "Fourteen" and Model 15 stuff
is B, which the same source rumored came from "Bell" since it was the
first machine made specifically for Bell.  Curiously the high speed
equipment didn't have these systematic prefixes.  Thus the BRPE high
speed reperforator, followed by the DRPE.  (I don't know if there was
a CRPE.  Maybe they skipped that knowning that it would be prounounced
"crappy".  The BRPE was commonly called Burpee, and the DRPE was
called Durpee.)

The old "iron horse" tape perforator was GPE, which I think came from
Green, as the pre-Bell machines were "blue code" for Postal Telegraph
and "green code" for Western Union.  There was a DPE perforator, which
was the perforator part of a Model 19 keyboard without the keyboard
cam and contacts.

An interesting comment by the late Walt Zenner was that Teletype would
occasionally make one-off machines or dummy machines to demonstrate
concepts.  In particular they did this at the request of young Navy
officers.  Old Navy officers already had their careers made, but
younger ones were trying to make names for themselves and Teletype was
happy to help them.