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WISE CONTROL INC : Indicating type differential pressure switch with bellows element_P640 series(P641, P642)
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Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: Siemens QBM 81-5 (5) : Amazon.in: Home Improvement
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