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US Patent: 519,639
Hydraulic valve
Patentee: Edwin S. Matthews (exact or similar names) - Cincinnati, OH USPTO Classifications: 137/625.31, 187/302, 91/397, 91/448 Tool Categories: Assignees: Edwin S. Matthews - Cincinnati, OH James L. Haven - Cincinnati, OH Manufacturer: Not known to have been produced Witnesses: James Fitton M. S. Belding	Patent Dates: Applied: Dec. 06, 1891 Granted: May 08, 1894 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for James L. Haven & Co.
Description: This valve-gear is intended for elevators.

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