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US Patent: 134,294
Improvement in rotary pumps
Patentees: Erwin Lavens (exact or similar names) - Middletown, CT James C. Lamb (exact or similar names) - Middletown, CT USPTO Classifications: 418/225 Tool Categories: industrial machines : pumps : rotary pumps Assignees: W. & B. Douglas - Middletown, CT Manufacturer: W. & B. Douglas - Middletown, CT Witnesses: Horrace Vansands Richard V. Singleton	Patent Dates: Granted: Dec. 24, 1872 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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