 Sales skyrocketed—several years posted 100% gains on the previous year.Always on the hunt for more efficiency and lower costs, in 1913 Ford introduced the moving assembly belts into his plants, which enabled an enormous increase in production.Although Ford is often credited with the idea, contemporary sources indicate that the concept and its development came from employees Clarence Avery, Peter E. Martin, Charles E. Sorensen, and C. Harold Wills.