OBSERVATION WINDOW THROUGH A WALL, ESPECIALLY OF A RADIO-ACTIVE SPEAKER.

摘要

P OBSERVATION WINDOW INCLUDING A SUCCESSION OF D11, D12, D13 PARALLELEPIPEDIC GLASS TILES, THE SUCCESSIVE TILES WITH DECREASING DIMENSIONS IN THE SENSE OF OBSERVATION AND THE D13 SLAB, THE SMALLEST AND LATERALLY SIDE LIBRARIOUSLY. PROJECTING AT LEAST PARTIALLY IN THE ENCLOSURE. /P