US Patent: 1,623,449 
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| Metal-cutting machine
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	        Patentee:
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 | Arthur Graham Thompson (exact or similar names) - New York, NY |  
 
 
 
 
 
 
 
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        Patent Dates:
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| Applied: | 
Nov. 17, 1924 | 
 
| Granted: | 
Apr. 05, 1927 | 
 
 
 
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                        Jeff Joslin Vintage Machinery entry for Racine Tool & Machine Co. Vintage Machinery entry for Henry G. Thompson & Son Co. 
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        Description: |  
| An undated catalog from the Racine Tool & Machine Co. states that this patent was used under license from Henry G. Thompson and Son Co. This invention provides improvements to patent 1,596,033. |  
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