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The original was posted on /r/whatisthisthing by /u/CurrentCress2400 on 2023-08-21 20:20:15+00:00.

Original Title: Cast iron piece 26" long and 5" wide. Says GLEANER HARVESTER CORP 47G-IS1 (not sure about the last 3 characters). Has 8 holes evenly spaced along two long edges, and several raised ridges in a chevron pattern down the middle of the length. Found beside a rural highway in Montana.