My sub collection of LRI's. The back row are all embossed. This is just a few of the know examples for porcelain LRI's. Porcelain ones date from about 1900-1940. Some of the companies that manufactured them: Henry F. Kretzer, Ohio Lightning Rod Co., P.P.{Porcelain Products} Inc., Miller, R.H.{Reyburn Hunter} & Co., CBFR {Cole Brothers Franklin Rods}.