Most (but not all) Hemingray insulators were embossed with style numbers (such as "HEMINGRAY № 40" or "HEMINGRAY-42". Some styles used names rather than numbers (such as "Muncie Type"), while others used letters or a combination of all of the above, such as: T.S., E2, № 1 Provo Type, etc. This page lists all known styles.
Styles Beginning with a Number
Styles Beginning with a Letter