The first ad is for Hemingray's "No O, Provo Type" style (CD 249) and was sent in by Nick Rodnicki, Jr. of Houston, Texas. It appeared in the July 11, 1908 issue of Electrical Review.

The second ad was found in the Western Electrician, December 3 1898 and is courtesy of Nathan Holmes, Wolcott, Iowa. It shows a CD 283 No 1 "Provo" Type. Note that there is a typo in the ad...the word insulator is missing an "n."