TY  - GEN
AU  - Van Valkenburgh,
TI  - Basic synchros and servomechanisms in Two parts
U1  - 629.8323,VAL 
PY  - 1955///
CY  - J.F.Rider Publisher
PB  - New York
KW  - Van Valkenburgh,
KW  - Basic synchros and servomechanisms
ER  -