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PCE
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DIFF Subgroup
G09B 1/36

the elements being connectible by corresponding projections and recesses

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Manually- or mechanically-operated educational appliances using elements forming or bearing symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways > comprising elements to be used without a special support > the elements being connectible by corresponding projections and recesses

CPC:

Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways (puzzle-games A63F9/00; advertising or displaying in general G09F) > comprising elements to be used without a special support > the elements being connectible by corresponding projections and recesses

No child classifications to compare. This is a leaf node in both IPC and CPC.