That is my story...approx. mid 70's when the US Air Force Base in Litchfield, Ariz called in for a 30 ton expansion valve. As a parts wholesaler I see this big rig with a boom pull up infront of store. A young GI comes in and says he is to pick up this 30 ton piece of equipment. I pull out the expansion valve from under the counter and say, "Here you go". To this day I still get comments from the techs at the air force base, the story has made the rounds.