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40-pin FPC to Straight 2x20 IDC Female Socket Header : ID 4905 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Pi-Zero-EzConnect – Securely Connect Components, Sensors, etc. to Raspberry Pi Zero 40 Pin Header – Oz Robotics
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Amazon.com: 2X 40 PIN GPIO Header Adapter Color-Coded Header Expansion Board for Raspberry Pi 400,Easy Expansion : Electronics
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1 Piece 2.54 Mm 40 Pin Female Stacking Header Connector Dual Row 2x20 Position For Raspberry Pi 2 Mode B& B+ Pc104 - Connectors - AliExpress
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Amazon.com: Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board (RAS-GP02),Green : Electronics
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Amazon.com: GeeekPi Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board 2 x 20-pin Strip Dual Male Header Double Row Straight GPIO Connector Pin Header Compatible with Raspberry Pi : Electronics
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5pcs 2.54 Mm 0.10" Pitch 2x20 40 Pin Elevated Socket Strip Female Header Through Hole Dual Spacer Gpio Contact For Raspberry Pi - Connectors - AliExpress
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