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US Patent: 134,548
Check-Valves
Patentee: John C. Hoadley (exact or similar names) - Lawrence, Essex County, MA USPTO Classifications: 137/495, 137/565.15, 137/614.2, 285/180 Tool Categories: propulsion and energy : steam engines : steam check valves Assignees: None Manufacturer: J. C. Hoadley Co. - Lawrence, Essex County, MA George G. Mc Lauthlin & Co. - Boston, Suffolk County, MA Witnesses: George R. Carter George A. Barnard M. W. Frothingham L. H. Latimer	Patent Dates: Granted: Jan. 07, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for J. C. Hoadley Co. "Vintage Machinery" entry for George G. Mc Lauthlin & Co.

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