Nearly all piano harps are made of cast iron.
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Most pianos are made of the same combinations of metals. This is an incomplete list: The frame is cast iron, the tuning pegs are steel, as are the bridge pins, the pedals are plated brass.
Piano strings are made of steel wire and the hammers and dampers are made of wood and felt. Piano tuning pins are made of metal. The frame can be made of wood or metal and the bridge can be made of wood or metal.
Open the top of the piano and look back where the "harp" attaches to the sound board you should see the serial number either on a tag attached to the sound board or to the metal frame of the harp then go to (on line) to "bluebookofpianos.com" and look up the serial number
Fritz Khula Piano was made by some manufacturers all over the world. F.Khula made in Hamamatsu, Japan by TOYO Piano MFG. (Apollo Piano) 's serial numbers (printed on golden frame) are in the link. Fritz Khula Piano were also made by: Lester Piano (Hamamatsu, Japan);before 1965 Sakamoto Piano(Hamamatsu, Japan);before1965 (after 1966, F.Khula was made by TOYO in Japan) Maridos piano Co.(Phillippins) N.Y. Euterpe Piano Fritz Khula (West Germany)you can see serials after lift up top roof,then engraved right side of wooden body. If your own F.Khula was made by TOYO, #83543 will be 1976 model.
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