A insulator manufactured by Swedish IFÖ, that were used on a aerial cableway which was used for transporting limestone. This cableway is now abandoned and the wires have been removed. The massive concrete poles have a ladder up to the top (for service purpose), where 9 of these insulators is mounted (3! for each wire), so pick the gems was quite easy... This insulator, with its style of the white telephone insulators, are rare except for the cableway and I managed to pick 14 of them.

[IFONA U ???]