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US Patent: 101,832
Improvement in pressure-gauges
Patentee:
Herman Chwatal (exact or similar names) - New York, NY

USPTO Classifications:
73/715

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

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

Manufacturer:
Ludolf Portong - Brooklyn, NY

Witnesses:
J. Rosengans
A. Bressie

Patent Dates:
Granted: Apr. 12, 1870

Patent Pictures:
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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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