R
started writing PLC programs in 1975; did relay control before that. Elec-trols one of our sister companies built printing press etc. some of them used flammable inks for printing on plastic.
as explosion proof electrical controls are expensive and hard to use went to air controls in the envelope worked great and no boom.
as explosion proof electrical controls are expensive and hard to use went to air controls in the envelope worked great and no boom.
