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| Patents for H. K. Boulter | |||||
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| Number | Date | Patentee | Title | Type | |
| 612,097 | Oct. 11, 1898 | H.R. Goodwin | Accessory For Use In Conjunction With Air Pumps | auxiliary wrenches | |
| 615,243 | Dec. 06, 1898 | A.E. Bocquet | Gas Cock or Valve | auxiliary wrenches | |