B21D 28/325
Perforating, i.e. punching holes in other articles of special shape {using cam or wedge mechanisms, e.g. aerial cams}
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Edits on 16 Mar, 2022
Golden AI
Edits on 9 Mar, 2022
Golden AI
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B21D 28/325
Perforating, i.e. punching holes in other articles of special shape {using cam or wedge mechanisms, e.g. aerial cams}
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