Hi Alan:

Re: Speaker vs. Receiver.
It may relate to size and how it's used.  For example early telephones used the 
termonology Transmitter for the microphone and Receiver for the earpiece.  So 
the "receiver" may be a small speaker intended for use in a handset.

Some Telephone Patent info going back to Bell's patent and photos of my Gallows 
phone see:  http://www.prc68.com/I/TelPat.shtml

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