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US Patent: 833,632
Steam hydraulic hoist
Patentee: William H. Ridgway (exact or similar names) - Coatesville, PA USPTO Classifications: 137/516.25, 60/431, 91/4R Tool Categories: material handling : hoists, winches, come-alongs Assignees: None Manufacturer: Craig Ridgway & Son Co. - Coatesville, PA Witnesses: N. H. Maitland Thomas Spackman	Patent Dates: Applied: Sep. 30, 1904 Granted: Oct. 16, 1906 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Craig Ridgway & Son Co.
Description: Subsequently improved in patent 914,978.

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