Inventor
ORR JOHN L
US3 patents
Patents
3 patentsUS4018487AApr 19, 1977
Cam adjustment for tension spring of sewing machine head lifter mechanism
KEYSTONE CONSOLIDATED IND INC9 citations70
US4201427AMay 6, 1980
Sewing machine positioner device
KEYSTONE CONSOLIDATED IND INC12 citations68
US3936084AFeb 3, 1976
Privacy lock
KEYSTONE CONSOLIDATED IND INC7 citations68