BS 4409 : Pt. 1 : 1969 : Specification for screw conveyors : trough type for industrial use
- London B.S.I. 1969
- 16p.
BS 4409 : Pt. 1 : 1969
621.867.4 /
BS 4409 : Pt. 1 : 1969
621.867.4 /
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