3 object circle, large outer side moveing around, white lights lasted for 3-4minutes

My girl friend and I were on our way home after visting another friend and we were both on our bikes. 
As both of us we riding our bikes, I looked up to the south/East about the large trees and right above them were the three objects hovering and not moving.  
I screamed, fell off my bike, my friend looked at me first and then looked up to see the exact same object not moving, but the outer part was moving around the main center part and the lights were white. 
She grabbed me to get up, I got back on my bike, screaming all the way home.  
When we got back to my house my mom came out to see what was going on.  I could not talk either could my friend. 
The object made a humming sound when the outer ring was moving round the center.  
The ojects followed us all the way down as soon as we both got on our bikes and riding home.  As soon as we got home, and my mom came out all three we gone. 
I have talked this this friend over the years about the experience but either one of us have told others, but my mom.  
I am happy to have an outlet to tell this story that happened because I have been holding it in for so many years.
Witness indicates that date in April 1974 is approximate.  PD