Tram/Train conductor's ticket clipper
Before electronic ticketing, a conductor sold passengers a ticket for the trip, and punched a hole in that ticket to prevent the conductor on selling the ticket (if one was left behind) or a passenger claiming a ticket was valid that had been used on a previous trip and to show what part of the ride the passenger had paid for. Hence if the passenger paid for three sections the three section square was clipped. Each clipper has a different pattern, and each conductor had a clipper issued to them. If an tram inspector got on the tram to check the tickets, the inspector would first take a sample of the conductors hole punch and then ask passengers for their tickets and compare the hole punch with the sample taken.