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US Patent: 455,787
Balance-wheel for time-pieces
Patentee:
Hugo Bilgram (exact or similar names) - Philadelphia, PA

USPTO Classifications:
368/171, 368/202

Tool Categories:
trade specific : clockmaker
trade specific : watchmaker

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
George E. House
G. Morgan Eldridge

Patent Dates:
Applied: May 24, 1890
Granted: Jul. 14, 1891

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Steve Gosselin
"Vintage Machinery" entry for Hugo Bilgram, Bilgram Machine Works

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