Abstract: An improved hanging display sign comprises boxes each having transparent e panels and a slot into which panels displaying letters are inserted to display a message. The letter panels are protected from inclement weather and from tampering by vandals by the transparent face panels and by sealing strips. A cable system is used to hold the boxes in a stack, with each box closing the opening in the top of the box below it. Drawing the cables tight holds the boxes together in a stack to form a weatherproof, vandal-proof display sign.

Abstract: A well installation preform for locating and dispensing granular materials nto a bore hole around the screen of a well casing is disclosed. A cylindrical sleeve containing a liner is assembled about the screen end of the well casing. The space between the sleeve and the well casing is filled with an ordered layer of granular material including a filter material adjacent the screen, a sealing material above the filter material and the screen and a quantity of filler material above the sealing material. The lower end of the sleeve is blocked while the preform is lowered into the well. The sleeve is thereafter removed whereby the liner is everted and the granular material is uniformly dispensed about the well casing in the bore hole. The sealing material forms a seal above the filter material for establishing an isolated filtration zone about the screen. A method of constructing the well using the preform and the resulting well structure is also disclosed.

Abstract: An explosive stemming device for dispensing granular material into a boree containing an explosive charge therein is disclosed as including a cylindrical member having a flexible sleeve-like liner adapted to conform to the interior thereof when filled with granular material. One end of the liner is turned around an end of the cylindrical member and secured thereto while the other end of the liner is fixed to a centrally positioned pipe whereby extracting of the member containing granular material from the borehole causes everting or turning inside out of the liner and dispensing of the material in the borehole.