Khanh,
I met a gent from Jerez, Spain through my wife's uncle(she is Spanish) while I was stationed in Rota, Spain 1995-2001. His name was Jose Caballero Navarra. He is apparently connected to inventing the Radio control airplane motors. He was quite a traveled character and he offered the pair to me 'cause as he said he was getting too old to use them and thought they'd enjoy the US!! I fell guilty that I am not much of a bird hunter and have not used them. I always imagined that they would end up in a South Dakota pheasant hunters' hands. I do admire them though!
Gary