Comments by "Biały" (@Bialy_1) on "2-Gun Action Challenge Match: US WWI Infantry (M1917 & M1911)" video.

  1. "In the early 20th century, they were also known as sun cheaters (cheaters then being an American slang term for glasses)" "In 1913, Crookes lenses were introduced, made from glass containing cerium, which block ultraviolet light."
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