TY  - BOOK
AU  - Roberts,Verne L.
ED  -  Institute for Product Safety.
TI  - Machine guarding : : a historical perspective / 
U1  - 691.8 ROB 
PY  - 1980///
CY  - Durham, N. C. : 
PB  - Institute for Product Safety, 
KW  - Machinery
KW  - Safety appliances
KW  - Patents
ER  -