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US Patent: 833,632
Steam hydraulic hoist
Patentee:
William H. Ridgway - Coatesville, PA

USPTO Classifications:
137/516.25, 60/431, 91/4R

Tool Categories:
specialty machines : hoists and winches

Assignees:
None

Manufacturer:
Craig Ridgway & Son Co. - Coatesville, PA

Witnesses:
Thomas Spackman
N. H. Maitland

Patent Dates:
Applied: Sep. 30, 1904
Granted: Oct. 16, 1906

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Craig Ridgway & Son Co.
Description:
Subsequently improved in patent 914,978.

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