640MAMPRSRF - 640M Single 4-pin Amp w/ RS-232 and RD40RF port
640M Indicators: Model 640M Indicator - Indicator: (single connector, J-box versions) : 640M Single 4-pin Amp w/ RS-232 and RD40RF port - Avery Weigh-tronix Part number: 640MAMPRSRF
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