Does the bridge crane include gantry?
Bridge crane is the same as the bridge, both ends of a fixed beam, no arched; gantry crane refers to its track part of the ground, there is a vault of the crane; there are semi-gantry crane, cantilever hanging;
According to your question, I guess, you are the bridge crane definition made a mistake
Gantry crane is also useful in the room, but in the outdoor use more!
This is just a definition of the problem, I think there is no need to argue!