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The MP-1 is a bit of a mystery. There's an TMC photo (below) of this unit, and it has its own Sales and Service Bulletin 105 (which I do not have a copy of), so it was clearly a TMC product.
It isn't clear what this unit is or does, but it appears to have been related to the McElroy Morse Package MP-1A. Note that it is quite different, apart from its black wrinkle finish, carrying handle, and nomenclature. For example, the tubes visible in this view are octal tubes, while the tubes inside the McElroy MP-1A are all miniature types.
So, what the heck is this thing? My speculation is that TMC may have re-sold an early version of the McElroy MP-1A in the time period between TMC's founding (1946) and the introduction of the MP-1A (1950 or before). I have not yet found any references to the MP-1 in the TMC drawings. If you have any information about this TMC product, please let me know!
To make matters a bit more confusing, the AWA's listing for this donation says:
This strongly suggests that TMC continued to offer the MP-1A in the version exemplified by the AWA unit. The McElroy MP-1A shows up in the 1950 ARRL Handbook in the ad below:
There is an example of the MP-1A in the AWA Museum, shown in the photos below.
|This photo shows the McElroy MP-1A front view.||Another front view.||In this view, one of the modules, the tape perforator, of the MP-1A is deployed.||Another view of the tape perforatort.|
|This show shows the internal components of the MP-1A. Note that the tubes are at the top of the photo and are all miniature types.|
Duncan Brown, AWA curator, describes this unit as follows: