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Ammogas Trademarks
AMMOGAS
METAL HARDENING ELECTRIC FURNACES AND AMMONIA DISSOCIATORS FOR CONTROLLING THE CHEMICAL COMPOSITION OF THE ATMOSPHERE IN THE HEAT TREATING CHAMBERS IN SUCH FURNACES
Cancelled
·
July 15, 1988
·
73740149
·
AMMOGAS
METAL HARDENING ELECTRIC FURNACES AND AMMONIA DISSOCIATORS FOR CONTROLLING THE CHEMICAL COMPOSITION OF THE ATMOSPHERE IN THE HEAT TREATING CHAMBERS IN SUCH FURNACES
Expired
·
July 28, 1943
·
71462383
·
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