US Patent: 3,504,413 
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| Cutting Blades for Block Type Cutting Tools
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	        Patentees:
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 | Robert J. Siewert (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI |  
| Harold J. Matsche, Jr. (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI |  
 
 
 
 
 
| Manufacturer: |  
| Not known to have been produced |  
 
 
 
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        Patent Dates:
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| Applied: | 
Apr. 28, 1969 | 
 
| Granted: | 
Apr. 07, 1970 | 
 
 
 
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                        Joel Havens "Vintage Machinery" entry for Giddings & Lewis Manufacturing Co. 
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        Description: |  
| Abstract:
 A solid cutting blade of the carbide insert type having grooves in its cutting face surfaces formed for creating positive axial and radial rake angles together with properly disposed chip-breaker surfaces when the blade is mounted in a negative rake block-type tool. Multiple grooves are provided so as to give multiple cutting faces on the same blade. |  
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