Abstract: A manually steerable machine for scabbling areas which are relatively inaccessible to larger machines is disclosed. Three pneumatically operable piston and cylinder assemblies with bits are mounted on a plate which is mounted in vertically movable relationship on a frame, the assemblies being disposed at the apices of a triangle, one of the apices being at the forward end of the frame and the other apices being rearwardly of the one of the apices. A tiltable handle extends from the rear end of the frame and upwardly from the frame and includes an air manifold and an air valve for supplying compressed air to the assemblies through hoses. A pair of wheels at the rear of the frame support the frame when the pistons are not operating. A skid plate is attached to the bottom of the frame, and the bits are encircled by a flexible skirt extending downwardly from the frame. A vacuum hose connector has its lower end at the bottom of the frame and between the bits to collect dust.

Abstract: Articles such as substantially flat, electronic chips (10) are positioned in an array with surfaces (11) to be treated facing upward along a succession of specially selected tiers. Such tiers may preferably be horizontal rows (20-24) of top rims (19) of vertical suction tubes (18). A leading row (20) of such top rims (19) is at a first elevation and each succeeding row is parallel to, elevated above and offset horizontally from a preceding row in stepwise fashion. At least one nozzle (40) is provided for propelling a stream (52) of a treating medium upon and at an angle "H" to the surfaces (11) to be treated. Angle "H" is selected so the medium and any dislodged matter is deflected from the respective surfaces (11) without contacting other such surfaces (11) of chips (10) positioned for treatment in the array.

Abstract: Production of cyanogen chloride by reacting hydrogen cyanide and chlorine in the gaseous phase in the presence of a low activity carbon catalyst.