US Patent: 1,524,474 
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| Feeler Gauge
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        Patent Dates:
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| Applied: | 
Jan. 03, 1922 | 
 
| Granted: | 
Jan. 27, 1925 | 
 
 
 
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                        Russ Allen. 
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        Description: |  
| Patent is applicable to any gauge that has multiple leaves that need to be locked in place. Locking mechanism utilizing a internally and externally threaded screw through the pivot point and a nut the applies the force to secure the leaves in place.  Utilized on Lufkin's No 74C thread gauge. |  
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