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DE-9 (DB-9) Male Plug to Terminal Block Breakout : ID 3123 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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DE-9 (DB-9) Male Plug to Terminal Spring Block Adapter : ID 4512 : $6.25 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: AAOTOKK DB9 Screw Terminal Block Adapter D-SUB 9-pin RS232 Male to 9+1 Pin/Way Female Serial Terminal Breakout Board Connector Signal Module with case (2Pcak/Male) : Electronics
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