Pre-NEMA Century Electric motor frame info? (Historical research.)

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Just Another Sparky

Joined Dec 8, 2019
235
Looking for historical information on pre-NEMA Century Electric motor frame sizes. Specifically the "lettered" frame sizes in wide use prior to the mid 1920s. I collect these old motors and would like to better understand the rhyme and reason behind the nomenclature.

Examples:
M7
M6X
RM10
P2
P10B
RS6
10L
6H
6J
 

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