73115073
Feb 7, 1977
May 16, 1978
AERATORS DESIGNED TO INTRODUCE AIR INTO POWDERED OR PULVERULENT BULK MATERIALS ENABLING THE SAME TO FLOW FROM BINS, HOPPERS AND CHUTES OR THE LIKE
MachineryMATERIAL LEVEL INDICATORS AND CONTROLS AND FOR MOTION INDICATORS, I.E. DEVICES FOR INDICATING WHETHER OR NOT A CONVEYOR OR MACHINE IS OPERATING
Electrical and Scientific Apparatus