Legman

During the nine-month Great Lakes shipping season, the ore hogs—shovelers, "larry" car weighers, bulldozer operators, car pushers and "leg" men—unite in this miracle of supply that stock-piles enough iron ore to last through the winter. The leg man on a Hulett iron-ore unloader must possess a special blend of brawn, brains and a "go for broke" attitude. He must also be conscious of the safety of fellow workers below him as he deftly maneuvers a 75-ton vertical ramrod and iron-jawed grab bucket.

Source: wiktionary

[W]ell, anyway, he sent a chap who acts as his confidential ‘leg-man’ and ‘Man Friday’.

Source: wiktionary

Guillam was boss and legman, and twice a day he dropped the tapes on the Berne residency, using a parked car as a letter-box.

Source: wiktionary

A large ship was discharging LASH (lighter aboard ship) barges at its aft end. [...] The crane broke down and a repairman was called. One legman descended from his post on a small raised platform to the deck next to the crane. Once repaired, the crane operator sounded a warning siren. Thinking all was clear, he started the crane toward the aft. The legman next to the crane ran aft and attempted to climb a small ladder next to his post. He was caught between the ladder and the crane, suffering multiple injuries.

Source: wiktionary