Abstract: A jet drop printer prints graphic information upon an oscillating printing medium. The printer has a row of jet forming nozzles which produce a row of spaced drop streams. The drops in the streams are selectively charged, deflected and caught, so that uncharged drops produce intelligible graphic information on the printing medium. The spacing between the jets is such that they cannot print contiguous traces upon an ordinary transported printing medium. Contiguous printing is accomplished by lateral oscillation of the printing medium. The oscillation of the printing medium causes each jet to be directed at a plurality of lateral printing positions on a sequential basis, and data representing printing information for the different printing positions is multiplexed into the drop switching system in synchronism with the oscillation of the printing medium.

Abstract: The single-ply, multi-panel envelope form comprises a pair of coplanar, envelope-defining panels disposed in end-to-end, spaced relationship and at least one intermediate panel disposed between and end-connected relationship with said envelope-defining panels wherein the opposite side edges of each intermediate panel are disposed inwardly of the corresponding side edges of the envelope-defining panels. The side edges of the envelope-defining panels of each form are disposed in contacting, sealed relationship when the panels of each form are zig-zag folded into envelope-defining relationship permitting removal of the intermediate panel from the interior of the envelope through access means provided in one marginal edge thereof.

Abstract: The single-ply, multi-panel envelope form comprises a pair of coplanar, envelope-defining panels disposed in end-to-end, spaced relationship and at least one intermediate panel disposed between and end-connected relationship with said envelope-defining panels wherein the opposite side edges of each intermediate panel are disposed inwardly of the corresponding side edges of the envelope-defining panels. The side edges of the envelope-defining panels of each form are disposed in contacting, sealed relationship when the panels of each form are zig-zag folded into envelope-defining relationship permitting removal of the intermediate panel from the interior of the envelope through access means provided in one marginal edge thereof.