More on the Dolph Double Trap Circuit (DDT)
Recently you were introduced to the DDT; a way to configure two hold-up alarm (HUA) devised so that…
News June 23Recently you were introduced to the DDT; a way to configure two hold-up alarm (HUA) devised so that…
News June 23A panic alarm system's failure during the brutal attack of a hotel clerk exposes the installing company's negligence.…
News March 6