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| Patents for Alfred Chatwin | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-190,908,038 | Jan. 13, 1910 | . | Improvements in apparatus for facing or preparing pipes for the purposes of making joints | pipe cutters | |
| GB-190,908,274 | Mar. 24, 1910 | A. Chatwin, J. Chatwin, T. Chatwin, T.P. Chatwin, J. Virtue | Improvements in and relating to die heads of screwing machines | metal threading machines | |