Abstract: The container is constructed so as to provide a plurality of compartments in the container body, in which the load is filled. The compartments are defined by an elastic membrane element so that the membrane elements can be expanded so as to provide a wider space particularly for the compartment formed by the membrane elements. The partition or partitions formed by the elastic membrane element are operated to move to a predetermined position by manual or mechanical means disposed outside the container so that the operation is rendered easy. The container body is provided a supporting element for resting the partitions so that the downwardly inclined slopes are provided so as to slide the load downward easily. Under the supporting element is also provided a bottom portion which can also be utilized for accommodating the load.The container of the construction can transport different kinds of loads on back and forth transportation.

Abstract: The valve-overlapping period of a spark ignition type, four stroke internal combustion engine extends within the range of 60.degree. to 90.degree. of crank angle with the valve overlapping period being generally equally divided to each side of the piston top dead center so that the pressure differential between the exhaust gas passage of the engine and the fuel and air intake passage causes the exhaust gas to counterflow from the exhaust gas passage to the combustion chamber and into the intake passage of the engine with the suction effect of piston descent being negligible when the piston is in the vicinity of top dead center.