double jaw pattern chain pipe wrench
vulcan chain pipe wrench
chain risk of supply chain
chain to chain competition
close-link chain [= short-link chain]
multi-pulse mode chain {= MP mode chain}
the system of supply chain and reverse supply chain
variable region gene of heavy chain and light chain
wrench shaft for pneumatic wrench
wrench sleeve for pneumatic wrench
chain-based and constant-based two-step method