[MCOH-EH] Doctor blades? (Trivia question)

william hyman wahyman at gmail.com
Thu May 11 07:13:23 PDT 2017

 In what industry might one see the sign "CAUTION: Handle Doctor Blades
With Extreme Care"?
( I will send a photo of such a sign in situ to anyone requesting to
wahyman at gmail.com.)
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