Abstract: In a bass-reflex type speaker system, in which sound signal waves radiating from the back of a speaker within a cabinet are emitted out through a hollow duct while the phase of the sound signal wave is reversed, the improvement comprising at least one dividing plate secured within the hollow duct and disposed parallel to the longitudinal direction of the duct or a hollow pipe with a diameter smaller than that of the duct, the hollow pipe being coaxially disposed within the hollow duct where the pipe may be made of sound absorbing material.

Abstract: A capsule having a cylindrical shell for containing goods to be transported, and a cover member adaped to be fitted over one end of the shell. The cover member is made from a flexible material and is provided on the leading end of the shell. The provision of the cover member of a flexible material avoids damage to or deformation of the capsule which would otherwise be caused by collision against the preceding or the next following capsule, and reduces the resistance offered to the movement of the capsule by the tubular passageway through which the capsule is moved.

Abstract: A capsule hydraulic-transportation system for use in continuously transporting capsules through a pipe line, in which system a discharge duct is connected in parallel at a forwarding station to a plurality of feeding ducts for feeding capsules, and the plurality of feeding ducts are by turns in timed sequence operated to continuously charge capsules into and transport same through the discharge duct to the pipe line.

Abstract: There is disclosed a horizontal type hydrohoist, in which slurry is forced to feed under lower pressure into feed pipes which are connected to a transport pipeline at their one ends and to a high pressure clear water pump at the others, said pump being adapted to deliver clear water under a high pressure, after which clear water is transferred under a high pressure through said feed pipe from said high pressure clear water pump, thereby transferring said slurry. This hydrohoist system presents the provision of means for preventing mixing and its spreading at the boundary portion between slurry and water within the feed pipes. More particularly, a separator which is designed not to rotate during the transfer is inserted in the aforesaid boundary portion in a manner that the separator may be transferred together with fluid, thus preventing the mixing of water with slurry as well as the resultant spreading thereof.