US Patent: 1,410,123 - Jeweler's Calipers


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US Patent: 1,410,123

Jeweler's Calipers

Patentee:

William Renfrew (exact or similar names) - Watertown, MA

USPTO Classifications:

33/800

Tool Categories:

layout tools : calipers

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Walter E. Lombard

Nathan C. Lombard

Patent Dates:
Applied:	May 20, 1920
Granted:	Mar. 21, 1922

Patent Pictures:

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Report data errors or omissions to steward Ralph Brendler

Description:

Thse calipers are designed for calibrating precious stones to determine their value. The size registers on a dial on the tool, which can be looked up on a chart to determine value.