Earliest reference to /dev/null I can find is in v4 sh(1) and nulldev in
nsys/ken/subr.c via TUHS archive https://minnie.tuhs.org/cgi-bin/utree.pl?file=V4 MFC after: 5 days
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@ -28,7 +28,7 @@
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.\" @(#)null.4 8.1 (Berkeley) 6/5/93
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.\" $FreeBSD$
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.\"
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.Dd June 5, 1993
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.Dd August 30, 2019
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.Dt NULL 4
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.Os
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.Sh NAME
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@ -54,4 +54,4 @@ device is always zero.
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A
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.Nm
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device appeared in
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.At v7 .
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.At v4 .
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