Inventor
KRIER KEITH N
6 patents
Patents
6 patentsUS4378855AApr 5, 1983
Multi-speed drive with forward/reverse lockout
TENNANT CO62 citations90
US4262382AApr 21, 1981
Multi-speed brush control
TENNANT CO29 citations90
US4138756AFeb 13, 1979
Surface maintenance machine drive and brush
TENNANT CO41 citations90
US3942218AMar 9, 1976
Scrubbing machine
TENNANT CO47 citations90
US3938212AFeb 17, 1976
Scrubbing machine
TENNANT CO31 citations80
US4334335AJun 15, 1982
Scrubber with hydraulic squeegee lift
TENNANT CO22 citations76