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Old 10-19-2020, 11:20am   #10
DAB
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known as PK nails, used by surveyors, as they have a little dimple in the center, so you can line up a staff or a plumb bob exactly.

https://en.wiktionary.org/wiki/PK_nail

became very familiar with these years ago in Antarctica when I helped out the surveyors a bit.
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