Houghton, P.S.
Gears : spur, helical, bevel, internal, epicyclic and worm - London Technical Press 1970 - various pages. : ill., photos.
621.833 / H6
Gears : spur, helical, bevel, internal, epicyclic and worm - London Technical Press 1970 - various pages. : ill., photos.
621.833 / H6