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A-Tech 16GB Module for HP ProBook 640 G4 Laptop & Notebook Compatible DDR4 2400Mhz Memory Ram (ATMS322455A25831X1) at Amazon.com
Amazon.com: HP ProBook 640 G2 14 Inch Business Laptop, Intel Core i7-6600U up to 3.4GHz, 16G DDR4, 512G SSD, Webcam, USB 3.0, Type-C, WiFi, VGA, DP, Win 10 Pro 64 Bit (Renewed) : Electronics
Amazon.com: HP Probook 640 G2 14 inches HD, Core i5-6300U 2.4GHz, 16GB RAM, 512GB Solid State Drive, Windows 10 Pro 64Bit (Renewed) : Electronics
Amazon.com: HP ProBook 640 G2 Laptop, 14 HD Display, Intel Core i5-6300U Upto 3.0GHz, 16GB RAM, 256GB NVMe SSD, DisplayPort, Wi-Fi, Bluetooth, Windows 10 Pro (Renewed) : Electronics
Amazon.com: HP ProBook 640 G4 Laptop - 14.0" FHD (1920 x 1080), 8th Gen Intel Core i5-8350U 1.7GHZ, 16GB DDR4 RAM, 256GB SSD, WI-Fi Windows 10 Pro (Renewed) : Electronics
Amazon.com: Keyboard Cover for 14" HP ProBook 440 445 G5 G6 G7 14, HP ProBook 430 G5, HP ProBook x360 440 G1 14", HP ProBook 640 G4 G5 14" Notebook Skin, Ombre Purple&Pink : Electronics
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Amazon.com: Touchpad Protector for HP ProBook 640 G4 (Touchpad Protector by BoxWave) - ClearTouch for Touchpad (2-Pack), Pad Protector Shield Cover Film Skin for HP ProBook 640 G4 : Electronics
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Amazon.com: New Genuine HP ProBook 640 G2 645 G2 430 G4 440 G4 US Keyboard Backlit with Frame 840801-001 : Electronics