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ES10883A1890-06-031890-06-03
A procedure for permanent annunciators in urinary kiosks using the transparency of the lantern crystals for this purpose.
ExpiredES10883A3
(en)
A procedure of permanent announcers in toilet pavilions using for this purpose the transparency of the glass of their facades with natural and artificial light.
A luminous sign system for transparency to be used at night and, at the same time, opaque, to be used during the day, with change of plates to compose the different signs that are desired.