Form, dimensions, accuracy of ranges of gear hobs, rotary form-relieved gear cutters, pinion type gear cutters for fine pitch gears to BS 978:Parts 1 and 2.
Replaced by BS 4582-2:1978, but remains current whilst other parts of BS 978 remain current.
Replaced by BS 4582-2:1978, but remains current whilst other parts of BS 978 remain current.
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