A marking assembly for printing selected information on a tape web and having a rotatably driven drum with an outer surface contacting one side of the tape web. The drum drives the web and marking means are disposed at the drum outer surface to produce a plurality of repetitive coded legends on the web. In a preferred embodiment the marking means includes a circular printer composed of an array of concentric electrodes formed in the drum outer surface, which electrodes are selectively energized to coact with an electrically conductive toner powder roller on the other side of the web to form toner images of the coded legends on the web through an electrographic process.
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