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US Patent: 453,980
Hydraulic valve-gear
Patentee: Edwin S. Matthews (exact or similar names) - Cincinnati, OH USPTO Classifications: 187/302, 91/358A, 91/428, 92/130B, 92/130R Tool Categories: Assignees: Edwin S. Matthews - Cincinnati, OH James L. Haven - Cincinnati, OH Manufacturer: Not known to have been produced Witnesses: J. W. See James Fitton	Patent Dates: Applied: Feb. 13, 1891 Granted: Jun. 09, 1891 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 patent is intended primarily for use in elevators.

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