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US Patent: 1,427,376
Trammel-Point Micrometer-Adjust Trammels
Patentee: Henry S. Grace (exact or similar names) - San Francisco, CA USPTO Classifications: 33/27.03 Tool Categories: layout tools : compasses : trammels Assignees: J. J. MacDonald - San Francisco, CA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 20, 1920 Granted: Aug. 29, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a set of drafting trammels which features a micrometer adjustment for the points.

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