Note(s) In this sub-class have been included only those lighting device details which were considered to be of a kind applicable to the lighting devices of more than one of the sub-classes Fulltext... Hierarchy... Expanded...F21L, Fulltext... Hierarchy... Expanded...F21M, Fulltext... Hierarchy... Expanded...F21P, Fulltext... Hierarchy... Expanded...F21Q, Fulltext... Hierarchy... Expanded...F21S. Inventions concerned with details of the kinds provided for are to be classified in this sub-class, even though they are only stated to be applied to a device of a single sub-class. |