ClipArt ETC
"A pin-chain of the link-belt type having a loose roller on each pin that joins the links. ... Roller-chain. a, links; b, pins joining links; c, pin without roller or next links; d, rollers on pin; e, roller in position without pin; f, slot and key holding links." -Whitney, 1911

Roller Chain

"A pin-chain of the link-belt type having a loose roller on each pin that joins the links. ... Roller-chain.…