MULTI-LAYER BLANKET COVERING ELECTRICAL POWER TRANSMISSION CONNECTORS USED TO PROTECT WORKERS FROM ELECTRICAL ARC EXPLOSIONS

SEISMOGRAPH, VIBRATION MONITOR INSTRUMENT FOR STRUCTURES SUCH AS BUILDINGS; VIBRATION SENSOR AND RECORDER OF VIBRATIONS IN STRUCTURES CAUSED BY EXPLOSIVE BLASTS

PNEUMATIC BLOW-OFF APPARATUS FOR PRODUCING PRESSURIZED BLASTS OF AIR FOR EJECTING PARTS