Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B26
HAND CUTTING TOOLS; CUTTING; SEVERING
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B26D
CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
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3/00
Cutting work characterised by the nature of the cut made; Apparatus therefor
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B26D3/10
Making cuts of other than simple rectilinear form
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B26D3/11
to obtain pieces of spiral or helical form
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