Abstract: A cover removal and installation roller assembly for an automobile that is particularly suited to be operated by hand, by an individual, in order to install or remove a cover from the automobile. The roller assembly includes a self-storing hand crank that is removably connectable to a cover spool whereby the cover spool can be rotated in order to wind the cover therearound or play the cover out from the spool. The cover in one embodiment is removably connectable to the cover spool. Methods for using the cover roller and installation roller assembly are disclosed.

Abstract: The present invention relates to silicon nitride mould parts, particularly crucibles for use in connection with directional solidification and pulling of silicon single crystals. The mould parts consist of Si3N4 having a total open porosity between 40 and 60% by volume and where more than 50% of the pores in the surface of the mould parts have a size which is larger than the means size of the Si3N4 particles. The invention further relates to a method for producing the silicon nitride mould parts.