TNAG-0534-FCO40-629-UK-aid-to-Hong-Kong-Polytechnic-and-technical-institutions-1975

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CENTRAL FILM LIBRARY

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2) HOBBING A WORM GEAR: INFEED METHOD

16 mm Film

3) HOBBING A HELICAL GEAR: TWO CUTS NON-DIFFERENTIAL METHOD

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OPTICAL GRATINGS AND MACHING TOOLS

Colour 1962

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