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The original was posted on /r/todayilearned by /u/TirelessGuardian on 2025-03-11 12:13:27+00:00.

Original Title: TIL the ViewMaster was introduced in 1939. Film and paper were scarce, and production nearly stopped due to WWII, but a contract to produce airplane and ship identification and range estimation reels saved the product. The military purchased 100,000 viewers and six million reels during the war.