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US Patent: 1,280,354
Compression Recorder
Patentees:
Charles J. Zigler (exact or similar names) - Chicago, Cook County, IL
William P. Holden (exact or similar names) - Chicago, Cook County, IL

USPTO Classifications:
346/133, 346/4, 73/712, 73/744

Tool Categories:
propulsion and energy : internal combustion engines : internal combustion engine indicators
industrial machines : industrial recording apparatus

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 31, 1915
Granted: Oct. 01, 1918

Patent Pictures:
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