Insulator on left is from Meleski Glass factory. The factory was located in Viljandi County, Estonia. It has the longest history of a glass factory in that country. Dating to the original Amelung & Co. in 1792. It made glass for the Russian Scar. Later other glass companies came from this same plant. They are Johannes Lorup,(second or middle picture starting in 1926 thus the marking J backwards L over T), Tarbeklaas, Scankristall and Glasstone. The original factory building still stands. In Meleski is a large private museum of glass (and insulators). The last picture of EKO on insulator was from a small factory close to Meleski in a little village called Eldapere. The two insulators on the right are from the 1920's. The Meleski insulator is from the pre 1926 before J. lorup took over the glass factory.