Inventor
LAM JOSEPH W
US4 patents
Patents
4 patentsUS4901649AFeb 20, 1990
Span bolster assembly
THRALL CAR MFG CO108 citations91
US4784067ANov 15, 1988
Lightweight center beam railroad car
THRALL CAR MFG CO32 citations91
US4753175AJun 28, 1988
Lightweight center beam railroad car
THRALL CAR MFG CO34 citations91
US4681041AJul 21, 1987
Lightweight center beam railroad car
THRALL CAR MFG CO31 citations91