have been around a few years, and have seen the Mastergurads, but have not seen this::Falcon safety product: auotmatic fire detector model FD36http://patimg2.uspto.gov/.piw?docid=03079886&SectionNum=3&IDKey=A84203CDB571&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1%2526Sect2=HITOFF%2526d=PALL%2526p=1%2526u=%25252Fnetahtml%25252FPTO%25252Fsrchnum.htm%2526r=1%2526f=G%2526l=50%2526s1=3079886.PN.%2526OS=PN/3079886%2526RS=PN/3079886
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