Punched Tape Concertina Coil

Punched tape was first used to program looms, in the 18th century. Similar looms are still used for weaving Tartans, but the punched tape is made of metal platelets today.Concertina wire or Dannert wire is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina. In conjunction with plain barbed wire (and/or razor wire/tape) and steel pickets, it is most often used to form military-style wire obstacles.Main function of the Concertina Wire is to form the concertina perimeter areas, high security, deterrence to prevent the intrusion of outsiders to a restricted area. The concertina is used in various sectors of industrial, military and governmental type among many other places.