318949.1337 pure cyclegraph. Hard to figure out, but I think it might be Jane Bunker's dentistry motions. This is based on the fact that related captions are for both bricklaying and dentistry, and these do not look like bricklaying.
Related captions: GL-60 "Record of skilled orthodontist showing admirable decision."
GL-68 "Studying orthodonture work of Dr. Jane G. Bunker."
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