TY  - RPRT
TI  - Electric direction signal systems other than semaphore type for commercial and other vehicles subject to special motor-vehicle laws (after market) 
PY  - 1941
PB  - National Bureau of Standards
CY  - "Gaithersburg, MD
SN  - NBS CS 80-41
DO  - 10.6028/NBS.CS.80-41
ER  -