White tops are newer than blue tops, change was made about early 70s. Mine are white, put up in "76 and "77. Weight depends on height, since upper panels are thinner. I had my 70 footer increased to 90 feet, so builder had to take it down to 50, then add correct thickness panels, and put the bottom back on. Glass is fused to steel, so weight of a panel is not the same as a steel sheet. Farm Show magazine had the story about the silo mover that moved them intact, laid down.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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