Small hollow pipe buried near property line -- marker of some sort

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What is this pipe? Found in ground near walkway of house. : r/whatisthisthing

Why would there be an over 5-foot pole buried in the ground in my backyard, leaving a half inch of the pole above ground? We were leveling the ground for a pool

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Alexander Robinson home, 216 Humboldt Ave. N. - Finntown -- Minneapolis -- Minnesota - s

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What is this pipe? Found in ground near walkway of house. : r/whatisthisthing