The U.S. Heartfield R&D Design Team The U.S. Heartfield R&D Design Team.pdf 100 KB Download Related articles The Who, What and Why of Heartfield. How can I find out when my American-made instrument was manufactured? How can I find out when my Japanese-made instrument was manufactured? 1993 Winter, Faster Pussycat Article Heartfield Parts Lists And Wiring Diagrams