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| Patents for John Foster | |||||
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| Number | Date | Patentee | Title | Type | |
| 445,972 | Feb. 10, 1891 | J. Caldwell | Compound Tool | combination tools | |
| GB-616,714 | Jan. 26, 1949 | J. Foster, P.C. Pickworth | Improvements in or relating to stamps or drop hammers | drop hammers | |
| GB-883,046 | Nov. 22, 1961 | F. Bainbridge, J. Foster | Improvements in counter-blow hammers | drop hammers | |
| GB-955,119 | Apr. 15, 1964 | J. Thornley, J. Foster | Improvements in counter blow hammers | drop hammers | |