Additional examples are adjusted to the entries in an automated way - we cannot guarantee that they are correct.
Edison screw lampholder adaptors (for NEMA 1-15 plugs) are still easily found and commonly used in the Americas.
Every ultraviolet lamp that is used in tanning equipment must be constructed so that it cannot be inserted and operated in a single-contact medium screw lampholder or a double-contact medium screw lampholder.