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US Patent: 4,784,371
Hydraulic jack having a small diameter bleed part in the cylinder wall
Patentee: William L. Kamper (exact or similar names) - Waukesha, WI USPTO Classifications: 254/93H Tool Categories: material handling : jacks : hydraulic jacks Assignees: Hein-Werner Corp. - Waukesha, WI Manufacturer: Hein-Werner Corp. - Waukesha, WI Witnesses: Unknown	Patent Dates: Applied: Jul. 16, 1987 Granted: Nov. 15, 1988 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hein-Werner Corp.
Description: The bleed port is 0.015 inches diameter and is formed using a laser.

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