| 摘要 |
A changeable message signal comprises a plurality of multiple light source panels arranged in rows for presentation of letters and numerals. The panels are energized in accordance with predetermined patterns and the patterns for the individual panels are changed by operation of stepping switches. A bank of circuit-selecting members such as printed circuit cards may readily be changed to change the information on the panels and each position of the stepping switches energizes a different set of the members to provide a multiplicity of messages in turn.
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