TY  - BOOK
AU  - Graf,Rudolf F.
AU  - Whalen,George J.
AU  - Farmlett,
AU  - Barsanti,
AU  - Wood,
TI  - How it works, illustrated: everyday devices and mechanisms 
SN  - 0285621734 :
U1  -  620 
PY  - 1975///
CY  - London
PB  - Souvenir Press
KW  - Technology
KW  - Popular works
N1  - Includes index
ER  -