ceiling mount

This was part of my father's studio. I took a picture of one of each of the various pieces. Here's what's included: 11 x double sliding carriages 4 x 4 wheel mounting carriages 5 x Bogen 6 wheel mounting carriages 4 x scissor pantographs 1 x 4" return 6 x ceiling mounts 5 x 15 1/2 foot rails 1...