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Ordnance Survey rivet benchmark on concrete top of culvert for Blackbridge Brook. The mark takes the form of a rivet at the tip of the familiar arrow cuts. The mark was levelled at 13.1491m above Newlyn datum and verified in 1960. Additional information on this and other nearby benchmarks may be found in the Bench Mark Database at http://www.bench-marks.org.uk/bm34056.