[Milsurplus] B-29 ARN-21 ?

[Hubert Miller]

I found Operating Instructions Radio Set AN/ARN-21 dated 1956. On the front
page is pencilled  " B-29  751 ".

This is an IFF-like 960-1215 MHz navigation system.

Is this likely to be a correct notation? 

-Hue                                                  

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