Two-channel hermaphroditic fiber connector
 A connector for hermaphroditic coupling with a similar connector has a hermaphroditic end cap which mates with the end face of the connector body when the latter is not in use. To ensure that the end cap is correctly located immediately the connector is disconnected, it is hinged to the connector body and spring-loaded to bias it closed. When two connectors are connected together, their respective end caps mate automatically so that they too are kept clean. This is possible because each end cap can pivot to a position in which its end face is coplanar with that of the connector body. Various locking devices are disclosed for locking two connectors together and for locking the end cap closed. 
Northern Telecom Limited
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Grant K. Helmut H.
Pacey Lukas