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US Patent: 101,832
Improvement in pressure-gauges
Patentee:
Herman Chwatal - New York, NY

USPTO Classifications:
73/715

Tool Categories:
propulsion and energy : steam apparatus : stationary boilers : steam pressure gauges

Assignees:
W. Staehlen - Unknown, NY
Ludolf Portong - Brooklyn, NY

Manufacturer:
Ludolf Portong - Brooklyn, NY

Witnesses:
A. Bressie
J. Rosengans

Patent Dates:
Granted: Apr. 12, 1870

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Ludolf Portong
Description:
The 1870 Brooklyn City Directory has a listing for "Portong Ludolf, steamgauges, 21 Dunham pl. h Lorimer n Montrose av".

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