Chain-bucket dredger and Ladder-bucket dredger

Ladder-bucket dredger and chain-bucket dredger are semantically related. In some cases you can replace phrase "Ladder-bucket dredger" with "Chain-bucket dredger", this phrases are similar.

Chain-bucket dredger and ladder-bucket dredger are semantically related. Sometimes you can replace phrase "Chain-bucket dredger" with "Ladder-bucket dredger", this phrases are similar.