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US Patent: 509,096
Caliper for Measuring Distances
Patentee: Charles W. Preston (exact or similar names) - San Francisco, CA USPTO Classifications: 33/542.1, 33/704 Tool Categories: layout tools : measurement gauges : surface gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: E. A. Brandau Wilson D. Bent, Jr. Alfred A. Enquist	Patent Dates: Applied: Jun. 17, 1893 Granted: Nov. 21, 1893 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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