The second contact is used for the lower-wattage filament of the two inside the lamp. This extra contact is a ring located around the main contact. Unlike bayonet sockets, three-way and regular lamps are interchangeable, 三路的灯有一个 d 后缀表示两倍的联系,通常 E26d 或 E27d,或很少 E39d...
PROBLEM TO BE SOLVED: To solve the problem wherein since a working vehicle 10 wherein a tire 19 and a crawler device 25 are interchangeable is subject to a separate setting change on each traveling device of a vehicle part 11 when changing from the tire to the crawler device, the ...