[Milsurplus] BC-639 Reciever..History?

[Tom Cook]

Hi,
Anyone know much about the BC-639?

Would like comments about it as i now have one and
have it apart on the bench for cleanup.

I hear the matching TX was the BC-640, no confirmation.

Also, who used it and what time frame...?

Thanks folks,

Tom -.- -.-. --... .-. -... -