Slide Rule PIC No 131 by A G Thornton
In lovely condition, with no warping, staining or peeling, this rule is still smooth to slide and looks virtually as good as new. The Patent No is 411090 and the model No is 131. I think this dates from the late 40’s but not sure. Unfortunately the instructions have gone into hiding somewhere. My father was an electrical engineer and used it in his work. Nice in a collection.
Price £35.00 or offers Plus P&P