Leydig, Voit & Mayer
Elevator remote-control apparatus
 When a desired call has been registered with the up button or down button of a remote controller, an acceptance signal is delivered from an elevator control device, to turn `on` the up button or down button of the hall button device. At the same time, a response signal corresponding to the acceptance signal is sent from the transmitter of the hall button device to the remote controller, and it is received by the receiver of the remote controller so as to turn `on` the response lamp in correspondence with the call registration. Owing to such an arrangement, the ascent or descent call registration of an elevator can be reliably acknowledged on the remote controller side. 
Mitsubishi Denki Kabushiki Kaisha
B B B
B66B B66B B66B
inventional additional additional
Kenji
Yoshida