Abstract: An apartment mailbox signal device to indicate the presence of outgoing mail in an apartment mailbox is comprised of a detachable mounting base having means for engaging a rotatable arm, a generally L-shaped rotatable arm for supporting a signal means, and a signal means connected to the rotatable arm indicating the presence of outgoing mail in the mailbox. The mounting base includes means for selectively securing the mounting base to an interior wall of the apartment mailbox and means for receiving or supporting the rotatable arm. The generally L-shaped rotatable arm is comprised of a vertical pivot member and a horizontal support member. The vertical member is received within the mounting base such that it may pivot about an axis parallel with the interior wall of the mailbox to which the mounting base is secured.

Abstract: A left zero fill circuit particularly suited for incorporation into non-buffered keypunch machines for providing a left zero fill capability thereto. The circuit provides a combination of registers and memory storage devices operable in an input mode to accept keypunch data, and in an output mode to punch the data onto a card in the proper locations within the field. The circuit further includes isolation means interposed in the interconnections between the keypunch machine and the left zero elements to isolate the power supplies and to allow the keypunch machine to be serviced in the normal manner, simply by switching the left zero fill circuit off.