OPINION
STAPLETON, District Judge:
This is a patent infringement action between two manufacturers of explosives and related products. Austin Powder Company ("Austin") has charged Atlas Powder Company ("Atlas") with infringement of the product claims in U.S. Patent No. 4,141,296 (" '296 patent"), now reissued as Re 30,621 (" '621 patent"), and of the method claim in Patent No. 4,133,247 (" '247 patent"). These patents involve non-electric delay blasting devices...
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