Stevens, Davis, Miller & Mosher
Evaporation vessel for use in vacuum evaporation
 An evaporation vessel for vacuum evaporation of electroconductive ceramic boat for use in the vacuum evaporation of a metallic or non-metallic substance by virtue of resistance heating, wherein the surface of the adjoining portion on the both sides of a cavity is lower than the top of the outside wall of the cavity. 
Denki Kagaku Kogyo Kabushiki Kaisha
C
C23C
inventional
Masaji Shuzou Akira Yukihiko
Ishii Watanabe Miyai Nakajima