| US Patent: 1,752,112 
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| Spirit level | 
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| Patentees: |  
 | Charles D. Severance (exact or similar names) - Greenfield, MA |  | Raymond O. Stetson (exact or similar names) - Greenfield, MA |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | Jun. 26, 1928 |  
| Granted: | Mar. 25, 1930 |  USPTO (New site tip)
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                        Jeff Joslin
 Vintage Machinery entry for Goodell-Pratt Co.
 
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| Description: |  | The Goodell-Pratt Catalog No. 17, issued 1930, lists this patent date on page 320 for their Six Glass Levels, Nos. 6024, 6026, 6028, 6030, 6124, 6126, 6128 and 6130. |  |