US Patent: 2,552,580 
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| Vise having jaws supportable on flat surface of machine tool by spindle adjustable and lockable in plane parallel to said surface
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	        Patentee:
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 | Henry Persson (exact or similar names) - Miami, FL |  
 
 
 
 
 
 
 
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        Patent Dates:
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| Applied: | 
Oct. 31, 1949 | 
 
| Granted: | 
May 15, 1951 | 
 
 
 
| Reissue Information: |  
| Reissued as RE23,519 (Jul. 01, 1952) |  
 
 
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                        Carl Matthews "Vintage Machinery" entry for Wahlstrom Float-Lock Product Co. "Vintage Machinery" entry for American Machine & Foundry Co. 
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        Description: |  
| 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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