drives and transmissions
preferred label: محرک و جعبه‌دنده @fa
type: Concept
narrower: joints (transmissions)

couplings
preferred label: جفت‌ساز @fa
type: Concept
related: joints (transmissions)

joints (transmissions)
related: couplings
broader: drives and transmissions
preferred label: اتصال(جعبه‌دنده) @fa
type: Concept