D-C arc welding apparatus

D.C. arc welder with solid state components

D.C. chopper with inductance control for welding

D.C. motor driven EDM head

Dam bar cutting apparatus and dam bar cutting method

Damper activation in a combined microwave and electric heating o

Damper drive in microwave heating appliance

Damper tube closure

Data display on a welding screen

Data input apparatus for microwave oven controllers

Data input apparatus for microwave oven controllers

Data path for high performance pattern generator

Daylight projection screen and method and apparatus for making t

DC arc plasma torch, for obtaining a chemical substance by decom

DC arc weld starter

DC Arc welding apparatus having variable current response

DC arc welding apparatus using high-frequency pulse current

DC plasma arc generator with erosion control and method of opera

DC Power source

DC power supply apparatus for arc-utilizing apparatuses