TGIF for Better String Phones

U.S. Patent No. 4,195,707
"Communicating Device"
Sam and Denise Kupperman
Glenview, IL
What is claimed is:

1. A device for communicating comprising a flat base and a hollow frustum integral therewith and extending outwardly therefrom, retaining means at the smaller end of said frustum, a discrete diaphragm complementary in shape to said smaller end of said frustum and held thereagainst by said retaining means, and means for connecting a string between a pair of said diaphragms, whereby when a string between two diaphragms is under tension conversation into one device is transmitted via the string to the other device.

Cited prior art here.
Referenced by later U.S. patent here.
Uncited prior art here.

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