| US Patent: 2,535,199 
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| Gear holding diaphragm chuck | 
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| Patentee: |  |
 | Bernard C. Day (exact or similar names) - Springfield, VT |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | May 28, 1947 |  
| Granted: | Dec. 26, 1950 |  
 
USPTO (New site tip)| Patent Pictures:
	      
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                        Jeff Joslin
 Vintage Machinery entry for Bryant Chucking Grinder Co.
 
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| Description: |  | "This invention relates to diaphragm chucks and has for an object to provide a chuck of this type suitable for supporting gears by engagement at their pitch circles so that their central bores are properly positioned for accurate finishing as by grinding." |  |