Haven't been able to find to much on the history of this company. Was formed sometime in 1905 and into the mid 1970's I think. They are famous for having one of the first patents for and expansion bolt (US945403A) granted 1/04/1910. What do they have to do with insulators? Check out the posts. Here are two catalogs I have from the 20's and the pocket sized one from 1960. If anyone has any other info on this company, please email me.