US Patent: 2,215,259 
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| Strain Gauge
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	        Patentees:
		   |  
 | Chester W. E. Witter (exact or similar names) - Ridgewood, Bergen County, NJ |  
| James G. Sisson (exact or similar names) - Athol, Worcester County, MA |  
 
 
 
 
 
| Manufacturer: |  
| Not known to have been produced |  
 
 
 
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        Patent Dates:
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| Applied: | 
May 25, 1939 | 
 
| Granted: | 
Sep. 17, 1940 | 
 
 
 
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                        Joel Havens "Vintage Machinery" entry for L. S. Starrett Co. Wikipedia entry for the L. S. Starrett Company  The Starrett Story History of the L. S. Starrett Co. 
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