What is "pipeliners"

Usage examples of "pipeliners".

College students and professors, lawyers, clerks, doctors, truck drivers, pipeliners, engineers, artists, musicians, writers—a hundred other professions that made up not just the field units of the Rebels, but people whose jobs were to stockpile and cache food, clothing, weapons, ammo, bandages, boots, socks, jackets, tents, blankets, sleeping bags, fuel, lanterns, rope and wire, tools, and the hundreds of other items essential for guerrilla warfare.