Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
G06G1/02—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales
G06G1/04—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by construction
Merkzeichenanordnung, bestehend aus Merkzeichen, die mit umgebogenen Kanten an einemFuehrungsfalz des Sichtrandes der Karten von Staffelkarteien verschieb- und feststellbar sind