Part 30a

30a.br2 Incorrectly cut 45° teeth, single-tapped, no holes	30a.br3 Centre not recessed, pointed teeth, single-tapped	30a.br4 Centre not recessed, correct teeth, double-tapped	30a.br Flats on teeth, double-tapped post-war stamping
30a.br1 Sintered brass, double-tapped

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