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BEAM1224(S) Single-ended Reflected Type Beam Smoke Detector Model BEAM1224 is uniquely suited for protecting open areas with high ceilings — areas where other methods of smoke detection are difficult to install and maintain. Features • 16- to 328-foot protection range • Single-ended, reflective design • User-friendly alignment procedure ONE-OF-TEN DECODER The LSTTL/MSI SN54/74LS42 is a Multipurpose Decoder designed to ac-cept four BCD inputs and provide ten mutually exclusive outputs. The LS42 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families. •Multifunction Capability •Mutually Exclusive Outputs