Abstract: An oil passage change-over valve allows an alternate communication from a first opening portion in one side a second and a third opening portion provided in another side to be changed over. A first opening portion is formed in one side of a valve body and the second and third opening portions are formed in another side of the valve body; a valve element within a valve hole of the valve body; and a communicating oil passage is formed in the valve element for alternately communicating the three opening portions. Inside the valve body, there are formed a first oil passage for connecting the valve hole with the first opening portion, a second oil passage for connecting the valve hole with the second opening portion, and a third oil passage for connecting the valve hole with the third opening portion deviated by 120 degrees from the first oil passage, respectively.

Abstract: An oil passage change-over valve allows an alternate communication from a first opening portion in one side a second and a third opening portion provided in another side to be changed over. A first opening portion is formed in one side of a valve body and the second and third opening portions are formed in another side of the valve body; a valve element within a valve hole of the valve body; and a communicating oil passage is formed in the valve element for alternately communicating the three opening portions. Inside the valve body, there are formed a first oil passage for connecting the valve hole with the first opening portion, a second oil passage for connecting the valve hole with the second opening portion, and a third oil passage for connecting the valve hole with the third opening portion deviated by 120 degrees from the first oil passage, respectively.

Abstract: A communication network capable of establishing an SVC bypass route when a failure occurs in a PVC multiplexed line wherein each of ATM switches at both ends of a PVC stores the relations of SVC specifying information and the other party PVC information in association with each PVC in a management table. At the time of bypassing, one of the switches transmits a message including the other party PVC information to another ATM switch for each PVC to be bypassed and another ATM switch specifies a PVC to be switched on the basis of the received message and switches the PVC to an SVC specified by the corresponding SVC specifying information stored in the management table.

Abstract: A communication apparatus capable of being connected to networks of a plurality of types, comprising a network discrimination table for discriminating an incoming network of a call setup message, a routing table for selecting an outgoing network of the call setup message, and a control unit for rewriting the contents of an address field and a sub-address field of the received call setup message on the basis of the routing table and transmitting the resultant message to the outgoing network.

Abstract: An excavator such as a backhoe has a group of hoses variable in length when a boom moves up and down. To avoid the group of hoses bulging to obstruct view when the boom is raised to an uppermost position, the group of hoses has a length absorbing portion disposed in a swivel base instead of being disposed on a boom as in the prior art.

Abstract: An excavator such as a backhoe has a group of hoses P variable in length when a boom 20 moves up and down. To avoid the group of hoses bulging to obstruct view when the boom is raised to an uppermost position, the group of hoses has a length absorbing portion P-10 disposed in a swivel base 7 instead of being disposed on a boom 20 as in the prior art.