Abstract: Arrangements for diverting and removing spoil created when a microtrench is being cut. The disclosed arrangements divert the debris and dust away from the microtrench during the cutting process. In optional embodiments, a spoil vacuum system is used to remove the dust particles during the debris diversion process. In further optional embodiments, a microtrench slot cleaning tool and slot vacuum system may be used. The microtrencher can be mounted on a skid-steer loader or a similar support vehicle.

Abstract: Arrangements for diverting and removing spoil created when a microtrench is being cut. The disclosed arrangements divert the debris and dust away from the microtrench during the cutting process. In optional embodiments, a spoil vacuum system is used to remove the dust particles during the debris diversion process. In further optional embodiments, a microtrench slot cleaning tool and slot vacuum system may be used. The microtrencher can be mounted on a skid-steer loader or a similar support vehicle.

Abstract: An improved flipper comprising a curved body having a foot pocket to receive a foot of a person therein. A shallow blade extends from a front end of the body. A heel strap is at a back end of the body to retain a heel of the foot of the person thereto. A dorsal fin extends outwardly from the body over the foot pocket. Propulsion, direction and diversion of water past the dorsal fin, will give directional guidance and stability to the person swimming in water.

Abstract: Spent aqueous hexavalent chromium solutions containing trivalent chromium ions and extraneous metal ions are oxidized by placing said exhausted Cr.sup.+6 solution in the anode compartment of an electrolytic cell as the anolyte, said cell being separated into anode and cathode compartments by at least one cation selective membrane, said cathode compartment containing a catholyte, and impressing a direct current across the anode and cathode of said cell of a difference in potential sufficient to promote the oxidation of trivalent chromium in the solution in said anode compartment to hexavalent chromium while extraneous metal ions in the anolyte solution migrate through said membrane into the catholyte of said cathode compartment where copper ions are plated onto said cathode. The anode compartment consists of a removable and portable container consisting essentially of a framework having side members secured thereto, at least one of said anode members comprising a cation selective membrane.