Cushman, Darby & Cushman
Fluorescent lamp device having oval cross sectional tubes
 A fluorescent lamp device includes a main body having a base, and a fluorescent lamp supported by the main body and electrically connected to the base. The lamp has a plurality of U-shaped glass tubes which define a zigzagging discharge channel. Each glass tube is provided with a pair of straight portions, each of which has a flat cross section. 
Kabushiki Kaisha Toshiba
Y H
Y02B H01J
additional inventional
Akihiro Hidenori Hitoshi
Inoue Ito Imamura