An attempt by Union Connector in the late 1970s to build a locking stage pin connector. The center ground pin had a retractable "hook" that would lock into a socket on the female. In practice, this hook was easily broken and the line was discontinued.
View attachment 5680
See also http://www.controlbooth.com/wiki/Collaborative+Articles:Connectors+Stage+Pin .
[file]Image:Harj-Lock.jpg|thumb[/file]
View attachment 5680
See also http://www.controlbooth.com/wiki/Collaborative+Articles:Connectors+Stage+Pin .
[file]Image:Harj-Lock.jpg|thumb[/file]
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