Rigging Training
https://training.bnl.gov/demo/BasicRiggingWorkbook.pdf
Crane Hand Signal
https://youtu.be/TGwR-08AeqQ
Crane Hand Signal Japan
https://www.evernote.com/shard/s353/sh/b8ff1c3d-348f-44dc-b835-8a3d2084d104/4437451b1b1f00e6cad2537c82d09887