Abstract: Screen panels are disclosed which are adapted to form a portion of a screening cylinder for screening fibrous material. The screen panels are unitary and made of wear-resistant material including a plurality of axially extending grooves on the outer surface of the screen panel, a plurality of slit-shaped screening orifices disposed at the bottom of the axial grooves, at least one support ring extending circumferentially across the surface of the screen panel and integral therewith, and a flange is formed at the sides of the screen panel so that the screen panels can be assembled together without the use of welding.

Abstract: A mobile communicator consisting of a wrist strap and an actual combined mobile communicator connected to the strap which includes at least two separate mobile communicator parts. The parts of the mobile communicator are mechanically connected by joints so that they can be folded inwardly against one another in repose position and can be opened profitably sequentially and in parallel when in a usage position. The mobile communicator parts are arranged to be opened outwardly for use in essentially a vertical direction compared with the plane of the wrist strap.