150mm 6"" No.4 ordnance scale ruler 1:1250 1:2500 1:10000 1:10560 6""=1 mile
Verulam
No.4 Verulam 150mm ordnance oval scale rule - Product No. 0312.04\n\nRIBA approved (Royal Institute of British Architects)\n\nScales: Side 1 - 1:1250 & 1:2500. Side 2 - 1:10 000 & 1:10 560 (6\""=1 mile).\n\nUK manufactured for reliable accuracy.\n\nAlso available in 300mm length.\nSupplied in a pvc plastic sleeve
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