(57) The invention concerns a device for the formation and replacement of messages in
advertising or informative display panels with multiple message, provided with number
of prisms (10;22) side by side and controllably rotatable, which carry on each face
(12) a portion of a message formed in its entirety by all the portions of message
positioned on the faces of the prisms having the same orientation. In order to make
the message replacement easier, each face (12) of each prism (10; 22) is provided
with one or more holding magnets (13, 14; 21, 24) and the relevant portion of message
is prearranged on a foil (15) of ferromagnetic material, that can be removably fastened
to the prism face by means of said holding magnets.
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