Abstract: A laser guided blind landing system for aircraft comprising in combination: a longitudinally extending runway, a plurality of laser beam generators mounted in longitudinally spaced alignment therewith at one end thereof, said generators being positioned to direct laser beams therefrom at progressively increasing coplanar inclinations away from said runway in progressive sequence from the nearest to the furthest therefrom, thereby to produce intersecting segments of said beams in pairs of each, of least slope adjacent said runway and of greatest slope remotest therefrom, the so intersecting laser beam segments thereby forming a continuous laser aircraft glide path of gradually decreasing slope from said segment remotest from said runway to that closest thereto. Preferably all of the laser generators radiate laser beams of distinctively different wavelengths or are tone modulated at different frequencies, except for the runway approach beam which may be of wavelength in the visible spectra.

Abstract: A bag of tubular form open at one end and closed at the other end, consisting essentially in the combination of: an outer tube comprising one or more contiguous plies of non-heat sealable, flexible sheet material, such as paper, and an inner tube comprising a ply of heat sealable, plastic sheet material, all of the plies being bonded together at both ends of the bag, with the inner ply otherwise detached from the outer tube, the outer tube having thermal transmission and flexibility properties such that the inner tube may be heat sealed to closure and severance thereat by compressive heat and creasing pressure applied to the outer tube, the inner tube being heat sealed to closure and terminated by severance adjacent the closed bag end, and the outer tube being closed thereat beyond the closure of the inner tube thereat, the bag being closeable at its open end after commodity charging, by heat sealing to closure and severing the inner tube adjacent the open bag end and then closing the outer tube thereat beyon

Abstract: A sift-proof, leak-proof bag formed from a gusseted, multi-walled tube of paper having stepped plies and bag walls at each end of the tube for attachment to the bag side walls to provide closed bag ends.

Abstract: A bag of tubular form comprising at least two plies of molecularly oriented plastic film, laminated together with their directions of orientation angularly disposed to each other and to the longitudinal direction thereof, said bag having at each end thereof one surface overlapping an oppositely disposed surface, a pair of oppositely disposed gussets interposed between said surfaces, said gussets extending at said bag ends into the overlap areas between said oppositely disposed surfaces, at least one bag end including all of said overlapping portions being folded over and adhered to the oppositely disposed surface, the bag in the preferred embodiment being closed at both ends and being provided with a valve sleeve for filling.

Abstract: Both fully automated and semi-automated methods and apparatus are described for producing armored rod saws by progressively coating a rod or wire substrate with a slurry of a flux paste adhesive and brazing metal powders, overcoating the latter with abrasive particles, followed by fusion of the brazing metal coating thence cooling same to solidify the brazing metal into a thin layer bonded to said substrate and partially embedding said abrasive particles therein with said particles projecting therefrom to provide a myriad of sharp cutting edges.