Tetrahedron with vector ends
vector with two anti-disease genes
allowable error system with double units
beam with double reinforcement
boilers with double rows of tubes
cable-stayed with double pylons
case history folder with double side
closure with double dykes
cold-rolled deformed bar with double wing
conductor with double insulation
diamond drilling technique of single power with double pipe
disk flying shears with double length size
extrusion head with double tubes
grinding mill with double rotating directions
heat exchanger with double moon
Heat pump with double high-temperature heat source
hyalinizing spindle cell tumor with giant rosettes