PJ30 PG52 on older props. whats this mean???

[wikelam]

What are these numbers on the props. the newer props have the diameter and pitch but whats up with the older ones?

 

[wikelam]

Re: PJ30 PG52 on older props. whats this mean???

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[OBJ]

Re: PJ30 PG52 on older props. whats this mean???

Hey wikelam....these are old Michigan Wheel part numbers.