Abstract: A key holding system including a binder. A pair of retention brackets are each secured on opposing cover members of the binder. The brackets are longitudinally disposed inwardly of free edges of the cover members. Each bracket defines a plurality of holding spaces. A plurality of tags are dimensioned for positioning in the plurality of holding spaces. The tags are used to hold keys.

Abstract: A high speed non-impact printing means including (1) a non-impact printer having at least one pair of print electrodes, and a recipient sheet and closely spaced donor sheet positioned between the print electrodes, with the donor sheet having a substantially uniform distribution of electrically conductive, mobile printing particles dispersed near the surface thereof adjacent to the recipient sheet, (2) a print signal generator, (3) a variable coupling means associated with each print electrode pair for connecting the associated electrode pair to the print signal generator, and (4) a coupling control means for selectively varying the coupling afforded by each of said coupling means. Each variable coupling means comprises an optically controlled variable capacitance device which may be selectively controlled by the control means to couple the associated print electrode pair with the print signal generator by a predetermined capacitance.