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/usr/share/gEDA/sym/micro/pic18F4431-1.sym is in geda-symbols 1:1.6.2-4.3.

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description=Microchip enhanced flash microcontroller with nanoWatt technology and high performance PWM and A/D
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PIC18F4431/4331 DIP
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refdes=U?
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PIC18F4431/4331-DIP
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documentation=http://www.microchip.com/