I noticed this marking in the sidewalk... and Steve looked it up, thanks Steve!

 Born in 1871 in Wisconsin to James and Mary Miracle, Orville began a career in the cement business in about 1901.

 He later established the Miracle Pressed Stone Company, manufacturing and selling “Miracle Concrete Blocks” across the upper Midwest. 

 However, it was his cement business that brought him the most success. He traveled from Iowa to South Dakota, Minnesota, Nebraska and even Montana, pouring cement for roads, sidewalks and curbing for cities and townships.

 Miracle’s association with San Diego began in 1927 when he was the low bidder on the contracts to improve streets throughout downtown and the ocean front. He laid miles of concrete sidewalks throughout San Diego that have long outlasted other cement walks poured decades after.

O. U. Miracle’s unusual name brought attention from many columnists across the country, including “Ripley’s Believe It or Not” in 1934.

thanks Steve!  and thanks to https://historiesandmysteries.blog/2019/11/05/o-u-miracle/comment-page-1/#comment-2747  for the article!