Indicator and announcer public service advertising. (Machine-translation by Google Translate, not legally binding)

摘要

Indicator of public and commercial announcer. Characterized by comprising one or two flat planes or molded of plastic material, cardboard, metal or mirror, so preferentemnte rectangular, which is determined one, two or more windows geometric variable in which and back or front plane intercambiables coupled foils containing texts concerning the indication time. (Machine-translation by Google Translate, not legally binding)