B PERFORMING OPERATIONS; TRANSPORTING
B65 CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
B65G TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
21/00 Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
B65G21/10 movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof