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 classified in this sub-class, even though they are only stated to be applied to a device of a single sub-class. |