BSI - BS 852
Specification for Toolmakers' Straightedges
|Publication Date:||19 June 1939|
|ICS Code (Measuring instruments):||17.040.30|
Straightedges of short length for very accurate work, having one working edge which is bevelled and very slightly rounded off ('knife-edge'). Material, general features , finish, accuracy, handles, glass test plate, case, packing, marking.