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US Patent: 379,423
Depth-Gage
Patentee: William D. Spencer (exact or similar names) - Middletown, CT USPTO Classifications: 33/544 Tool Categories: layout tools : measurement gauges : depth gauges Assignees: None Manufacturer: Unknown Witnesses: Henry S. Leonard Eliahu W.N. Starr Robert Everett J. A. Rutherford	Patent Dates: Applied: Dec. 27, 1887 Granted: Mar. 13, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This depth gauge uses a micrometer adjuster, and is constructed such that the scale is clearly visible when the tool is in use. Known examples are marked only with the patent date.

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