. Transactions of the Society of Motion Picture Engineers (1921). IH KSPI ^Wwfit^^%i^8 |^^^HPI|K|^^iJn^^^ r^S 2t T 5,JL?d 1 ^« ^^^^^ 5 T

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Keywords: ., bookauthorsocietyo, bookcentury1900, bookdecade1920, bookyear1921