DIFF Subgroup
G03B 21/58 collapsible, e.g. foldable; of variable area
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Projectors or projection-type viewers; Accessories therefor > Accessories > Projection screens > collapsible, e.g. foldable; of variable area
CPC:
Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00) > Accessories > Projection screens > collapsible, e.g. foldable; of variable area
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 2014.
Child Classifications
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