An array of tire chains and repair parts from a 1946 ad. W: repair links to quickly mend a broken cross-chain on the road. X and Y: replacement cross-chains. Z: strap-on emergency chain. These emergency snow chains were meant to be used three or four to each wheel, and could only be used on spoke wheels or disc wheels with slots. AA: car tire chain. BB: single truck version. CC: double set for use on dual truck wheels.