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GSP 473-802-300 I4 Standard Handsets

Mar 79.  Types 81, 810 and 811.  An interesting practice that tracks the various nuances of AECo
handsets; especially transmitter and receiver caps. Plus, I gather, AECo
used North Electric handsets and even manufactured special caps that
would allow them to be converted for use with A.E. transmitter and
receiver elements.

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