I am not a CD guru, so I can only report information that I have been told. These are interesting glass pieces and show-n-tell items from the Roseville Show. The veteran insulator collector who showed them to me said they and others were personally salvaged from the dumpster of a clean out of an old Pacific Telephone & Telegraph building. He said they were the glass legs of a battery rack, which makes them a type of battery rest, which has not been seen or reported before by the hobby. Next pic [id=519187569]