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US Patent: 1,998,004
Differential Hydraulic Speed Gear
Patentee:
Hans Ernst (exact or similar names) - Cincinnati, Hamilton County, OH

USPTO Classifications:
60/448, 60/450, 91/477

Tool Categories:
metalworking machines : metalworking machine mechanisms : hydraulic apparatus
metalworking machines : metalworking machine mechanisms : metalworking variable speed mechanisms

Assignees:
Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH

Manufacturer:
Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH

Witnesses:
Unknown

Patent Dates:
Applied: May 23, 1930
Granted: Apr. 16, 1935

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Cincinnati Milling Machine Co.
Description:
This patent number was seen on a Cincinnati Milling Machine Co. patent plate 4FV-101.

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