photobeam

photobeam
A beam of light whose interruption triggers a warning or a mechanism (such as a door)

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  • PBQ — Painted Bride Quarterly (Community » Media) * Pittsburgh Bible Quizzing (Community » Religion) * Pimenta Bueno, RO, Brazil (Regional » Airport Codes) * Prism Brass Quintet (Community » Music) * PhotoBeam Quantum (Academic & Science » Physics) …   Abbreviations dictionary

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