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US Patent: 93,974
Improvement in knapsack-engine Knapsack fire extinguisher
Patentee: Joseph W. Douglas (exact or similar names) - Middletown, CT USPTO Classifications: 222/175 Tool Categories: specialty tools : firefighting tools : fire extinguishers Assignees: W. & B. Douglas - Middletown, CT Manufacturer: W. & B. Douglas - Middletown, CT Witnesses: D. W. Raymond John M. Douglas	Patent Dates: Granted: Aug. 24, 1869 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for W. & B. Douglas

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