#supply_chamber  a mechanical device for holding something and supplying it as needed
  supertype:  #mechanical_device  mechanism consisting of a device that works on mechanical principles
  subtype:  #cartridge_holder__cartridgeholder__cartridge_clip__cartridgeclip__clip__magazine  a metal frame or container holding cartridges; can be inserted into an automatic gun
     subtype:  #pincurl_clip__pincurlclip  a variety of clip for holding pin curls
  subtype:  #magazine.supply_chamber__cartridge  a light-tight supply chamber holding the film and supplying it for exposure as required

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