Abstract: A menu board is provided which utilizes members carrying interchangeable numbers, letters or other characters, and possesses special features which render the menu board highly legible. The menu board is provided with window-like openings and means for replaceably mounting the interchangeable character members behind the board openings. The character members include appendages selectively engageable with end stops provided on the board, or with slots provided on the board for positioning and locking the members in place. In one embodiment, the characters are each of a selected length and are overlaid one upon the other within the board openings, but so that the characters themselves are not overlain as viewed from the front of the menu board. Alignment means is provided for controlling the registration of the characters with respect to one another within the windows, and locking means is provided for securing each group of character members in place.

Abstract: An improved lamp, holder and adapter are provided, the lamp including an elongated body and lamp bases at each end of the body, and the holder for the lamp comprising a frame and a pair of end sockets adapted to receive the lamp bases. Each lamp base includes a plug carrying a pair of spaced electrical conductors for detachable connection to corresponding conductors within the end sockets, the latter being connected to a suitable source of electric current. At least one of the sockets includes an irregularly shaped socket recess, and at least one of the lamp plugs has a groove therein. An adapter element is provided interposed between the grooved lamp plug and the socket having the irregularly shaped recess, with the adapter carrying a tongue on one side sized and shaped to lockingly nest within the plug groove and having its opposite side shaped complementary to the socket recess for locking mating engagement therewith. Several lamp plug groove shapes and arrangements are described.