[Milsurplus] ID connectors ?

[Hubert Miller]

Found some PL-Q61
also PL-106
What are these for?

Also i have connectors for the GP-6, 7.   These seem to be marked with single letters, like B or E. Yes, i know there are not big numbers of GP transmitters out there just waiting for connectors.

Also, what is the difference between RU series connectors 133 and 233 ?
Also, the phone plug #275 for the RU series - a phone plug with a threaded locking collar - is this only for the meter jack on the receiver control box ?
thanks-
Hue
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