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| Patents for Hart Emery Wheel Co., Ltd. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 201,778 | Mar. 26, 1878 | G. Hart | Emery Wheel | |
| CA-9,096 | Aug. 06, 1878 | G. Hart | Improvements on emery wheels | ||
 | RE10,937 | Jun. 05, 1888 | S.C. Rogers | Saw-filing machine | |
| CA-71,002 | Apr. 16, 1901 | G. Hart | Emery wheel chuck | ||
| CA-91,883 | Feb. 28, 1905 | G. Hart | Grinding wheel | ||
 | 945,526 | Jan. 04, 1910 | G. Hart | Grinding-wheel | |