| US Patent: 99,961 
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| Improvement in Calipers | 
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| Patentee: |  |
 | William Slar (exact or similar names) - Franklin, PA |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Granted: | Feb. 15, 1870 |  USPTO (New site tip)
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                        Ralph Brendler
 
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| Description: |  | This caliper design feature a pair of adjustable graduated arcs, one for reading inside measurements and one for reading outside measurements. |  |