Abstract: In order to simplify and improve the fly-back suppressor in a roll tape measure having a box-shaped housing 1, serving as a handle and made up of two rigidly interconnected halves 2, 3 of elastic plastic, an approximately dish-shaped drum 5 subjected to the force of a tension spring and mounted on a shaft 4 or a bolt 15, a measuring tape 9 wound onto the drum and a manually operable fly-back suppressor for the said tension spring. The housing 1 contains a brake body 12, 17 which rests against the drum under the effect of spring pressure and which can be operated from the outside.

Abstract: A gypsum board consisting essentially of a monolithic cellular core of set gypsum and a fiberous cover sheet encasement provided with improved properties by the gypsum core having incorporated therein coal fly ash in an amount of about 1-20% by weight of stucco in the gypsum slurry used in forming the board and method of producing the board are disclosed.

Abstract: Asbestos fibres having excellent properties in resin reinforcement are produced by controlled heat treatment of a coarse fraction of chrysotile asbestos fibres.

Abstract: Asbestos fibres having excellent properties in resin reinforcement are produced by controlled heat treatment of a coarse fraction of chrysotile asbestos fibres.

Abstract: The filtration rate of asbestos-cement slurries formed from chrysotile asbestos fibres is improved by controlled heat treatment of the fibres at a temperature of about 400.degree. to about 600.degree. C. without loss of water of crystallization and fibre strength. The improved filtration rate allows an increased rate of production of asbestos-cement products.