VSN

Electronic control circuits for controlling electric heaters for piping systems; Electric control panels for controlling electric heaters for piping systems used in semiconductor and flat panel display manufacturing equipment and systems, said equipment and systems consisting of low pressure chemical vapor deposition (LPCVD) systems, plasma enhanced chemical vapor deposition (PECVD) systems, chemical vapor deposition (CVD) systems, flat panel display (FPD) manufacturing systems, atomic layer deposition (ALD) systems and metal etch vacuum piping systems