Here's a lot of the info on the rangefinder in this old thread
http://www.bowlingboards.com/threads...ll=1#post13032
Here are the original instructions for the "Rangefinder" (that's what the dots and arrows are called. It doesn't have the breakpoint markers. Those are a modern addition to the lanes.)
Rangefinder ® system by Brunswick
It was invented by Lowell Jackson back in the 1930's
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