71653181
Sep 14, 1953
Jul 20, 1954
AUTOMATIC ELECTRICAL TIMER SWITCH ELEMENT WHICH PREDETERMINES THE DURATION OF OPERATING PERIODS OF WATER SPRINKLING SYSTEMS, AUTOMATIC CLOCK WHICH STARTS WATER SPRINKLING SYSTEMS AT A PREDETERMINED TIME, AND AUTOMATIC SWITCHING ELEMENT WHICH MEASURES MOISTURE BY MEANS OF ELECTRICAL RESISTANCE TO DETERMINE MOISTURE DEFICIENCY
Fancy Goods