/usr/share/gEDA/sym/74/74166-1.sym is in geda-symbols 1:1.6.2-4.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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device=74166
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footprint=DIP16
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refdes=U?
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description=8-bit parallel-in/serial-out shift register with clear
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numslots=0
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net=Vcc:16
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net=GND:8
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74166
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documentation=http://www-s.ti.com/sc/ds/sn74hc166.pdf
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