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Throw Distance Calculator
File:Vintage Panasonic Electronic Pocket Calculator, Model 660 (aka JE-660U), 6 Digit Fluorescent Display, Made In Japan, Circa 1974 (14190103722).jpg - Wikimedia Commons
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Optional Lens Guide | Projector | Panasonic Global
Throw Distance Calculator
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Download | Projector | Panasonic Global
File:Vintage Panasonic Model 660 (aka JE-660U) Handheld LED Electronic Calculator, Made in Japan, Price Was $59.95 in 1974 (8716009192).jpg - Wikimedia Commons