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US Patent: 427,044
Steam Engine Indicator
Patentee:
Almon B. Calkins - Bridgeport, Fairfield County, CT

USPTO Classifications:
92/162R, 92/86

Tool Categories:
propulsion and energy : steam apparatus : steam indicators

Assignees:
Ashcroft Mfg. Co. - Bridgeport, Fairfield County, CT

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Aug. 05, 1889
Granted: May 06, 1890

Patent Pictures:
USPTO pdf tiff
Google Patents
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"Vintage Machinery" entry for Ashcroft Mfg. Co.

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