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Model 3720 Dual 1x30 Multiplexer Card (auto CJC with 3720-ST)
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Model 3721 Dual 1x20 Multiplexer Card (auto CJC with 3721-ST)
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Model 3722 Dual 1x48, High Density, Multiplexer Card
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Model 3723 Dual 1x30, High Speed, Reed Relay Multiplexer Card
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Model 3724 Dual 1x30 FET Multiplexer Card (60 differential channels, automatic CJC with 3724-ST accessory)
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Model 3730 6x16, High Density, Matrix Card
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Model 3731 6x16 High Speed, Reed Relay, Matrix Card
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Model 3732 Quad 4x28, Ultra-High Density, Reed Relay Matrix Card
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Model 3740 32-channel Isolated Switch Card
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Model 3750 Multifunction Control Card (40 digital I/O bits, 2 analog output channels, and 4 counters)