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US Patent: 218,707
Improvement in mechanical telephones
Patentees:
Charles H. Billings - Cincinnati, OH
Marcellus J. Maxwell - Cincinnati, OH

USPTO Classifications:
181/138

Tool Categories:

Assignees:
Charles H. Billings - Cincinnati, OH
Marcellus J. Maxwell - Cincinnati, OH
Walter W. Bostwick - Cincinnati, OH

Manufacturer:
Not known to have been produced

Witnesses:
Walter W. Bostwick
L. M. Hosea

Patent Dates:
Applied: May 08, 1879
Granted: Aug. 19, 1879

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for W. W. Bostwick & Co.

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