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U.S. Patent for Manhole marker assembly Patent (Patent # 12,509,841 ...
Jul 12, 2022 · Justia Patents Turnbuckle U.S. Patent for Manhole marker assembly Patent (Patent # 12,509,841)
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Dec 30, 2025 · US 12,509,841 B2 Manhole marker assembly Spencer J Lambeth, Sandy Springs, GA (US); and Frank Joseph Sinapi, Oxford, GA (US) Assigned to Spencer J. Lambeth, Sandy …
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