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10 ft USB to Parallel Printer Adapter - Parallel Cards & Adapters | StarTech.com
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Parallel Port To USB Adapter Cable for Printer - Walmart.com
4-port USB to Serial RS232 Converter
Ethernet to Serial & HID Keyboard Converter – Intelletto Online Store
USB to 4-Port RS-232 DB9 Serial Interface Adapter - Sealevel
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USB to TTL 3.3V Converter – CommFront
USB To DB25 Parallel Port Printer Adapter Cable
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16 Port USB to RS-232 422/485 Metal Serial Adapter DIN-Rail Mount - Coolgear
USB to 2-Port Isolated RS-232, RS-422, RS-485 DB9 Serial Interface Adapter - Sealevel
USB to RS422 adapters (HIGH SPEED) — Connective Peripherals - US Store
USB 2.0 To RS232 DB9 Serial Port Cable Adapter | Cables.com
ATEN - serial adapter - USB - RS-232 - UC232A - USB Adapters - CDW.com
Buy RS232 USB to RS232C Serial Port Adapter - CNC Specialty Store
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StarTech.com USB to RS232/RS485/RS422 Industrial 4 Port Serial Hub Adapter - USB to Serial Converter - ICUSB234854I - USB Adapters - CDW.com
Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
USB to RS232 Serial Cable + MAX3232 RS232 to TTL Serial Adapter Converter Module | eBay
USB to RS232 Converter - 6ft - CAB-11304 - SparkFun Electronics
USB C to Serial Adapter w/ COM Retention - Serial Cards & Adapters | StarTech.com
