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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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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