Birch, Stewart, Kolasch & Birch
Electrical plug assembly which accommodates multiple voltage
 A plug assembly includes a main plug member having a pair of main plugs, a pair of elongated cylindrical apertures and a pair of elongated rectangular apertures, and a plug adapter member having a pair of cylindrically shaped terminals and a pair of elongated cylindrical first apertures disposed on one side wall and a pair of rectangular shaped terminals and a pair of elongated cylindrical second apertures disposed on other side wall thereof, the cylindrical shaped terminals and rectangular shaped terminals connecting to the first and second apertures, respectively, whereby the plug assembly enables the selective use of either one terminals or other terminals depending upon high voltage or low voltage usage. 
H
H01R
inventional
Jungshin
Kim