DIFF Subgroup
G09B 11/06 Devices involving the use of transparent or translucent tracing material, e.g. copy books
Introduced: September 1968
Full Title
Teaching hand-writing, shorthand, drawing, or painting > Devices involving the use of transparent or translucent tracing material, e.g. copy books
No child classifications to compare. This is a leaf node in both IPC and CPC.