Inventor
ARMSTRONG ROBERT M
US5 patents
Patents
5 patentsUS5404577AApr 4, 1995
Combination head-protective helmet & communications system
CAIRNS & BROTHER INC260 citations96
US5200736AApr 6, 1993
Assembly for monitoring helmet thermal conditions
CAIRNS & BROTHER INC66 citations94
US5097826AMar 24, 1992
Pressure monitoring device for self-contained breathing apparatus
CAIRNS & BROTHER INC62 citations94
US5271390ADec 21, 1993
Positive pressure breathing assembly and demand regulator therefor
CAIRNS & BROTHER INC29 citations89
US5000174AMar 19, 1991
Positive pressure breathing assembly and demand regulator therefor
CAIRNS & BROTHER INC18 citations70