Electrical and scientific apparatus Trademarks Filed in April 25, 1957
BTC
Filed: April 25, 1957
ELECTRICAL TRANSMISSION LINE HARDWARE
Owned by: BREWER}TITCHENER CORPORATION
Serial Number: 72028837
TACH-X
Filed: April 25, 1957
DEVICE FOR INCREASING SPEED AND ACCURACY OF PERCEPTION
Owned by: MCGRAW}HILL, INC.
Serial Number: 72028846
