TNAG-0534-FCO40-629-UK-aid-to-Hong-Kong-Polytechnic-and-technical-institutions-1975 — Page 166

FCO40 Hong Kong Department Records 聯邦事務部香港部檔案 All
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CENTRAL FILM LIBRARY

Con't.

2) HOBBING A WORM GEAR: INFEED METHOD

16 mm Film

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

My

#1

OPTICAL GRATINGS AND MACHING TOOLS

Colour 1962

M17

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