Meanings of rust-free in English

The ad that he answered described a West Coast rust-free truck.

The driveway and parking area were clearly defined; the matching white toolshed stood rust-free on a neat concrete slab.

But a man from maintenance had come in, done some work on the pipes, and declared them to be rust-free.

Most spectacularly, Moscow announced this month that explorers had planted a rust-free Russian tricolor beneath the North Pole in waters 4,261 meters (13,980) deep.