Archived posting to the Leica Users Group, 2014/05/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I don't know when they were first available, but I have an 1893 Carnegie Steel Handbook that has them in both plain and galvanized steel, and I don't think they were a new product at that time.Matt>OTT: when were undulated steel sheets first mass produced?>I couldn't find this on the net, so if someone could help ? >would-be ghost town archeologists such as me need to know :-) >Amities >Philippe