It was actually Chickering that introduced the steel-frame piano. From Wikipedia: "Jonas Chickering made several major contributions to the development of piano technology, most notably by introducing a one-piece, cast-iron plate to support the greater string tension of larger grand pianos."
It was actually Chickering that introduced the steel-frame piano. From Wikipedia: "Jonas Chickering made several major contributions to the development of piano technology, most notably by introducing a one-piece, cast-iron plate to support the greater string tension of larger grand pianos."