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US Patent: 2,552,580
Vise having jaws supportable on flat surface of machine tool by spindle adjustable and lockable in plane parallel to said surface
Henry Persson - Miami, FL

USPTO Classifications:
269/244, 269/279, 269/73, 269/78, 269/84

Tool Categories:
metalworking machines : drilling and boring : drill presses : drill press accessories
work holding : vises : metalworking machine vises

Float-Lock Corp. - Bloomfield, NJ

American Machine & Foundry Co. - New York, NY


Patent Dates:
Applied: Oct. 31, 1949
Granted: May 15, 1951

Reissue Information:
Reissued as RE23,519 (Jul. 01, 1952)

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for American Machine & Foundry Co.
This is the well-known Float-Lock vise, which (as of 2017) is still in production as the Wahlstrom Float Lock Drill Press Vise from Penn Tool Co., Inc.

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