Conversion. Pianos to airplane motors. Preparing sharps and flats for a nation of jitterbugs has given way to the preparation of trainer-plane motors for a nation dedicated to victory, in this Chicago factory now converted to war production. Bernice Strutz (left) and Clara Bernas are pictured at their pre-war work of installing regulating screws in a piano keyboard. Today they assemble pneumatic motors for Uncle Sam's trainer planes. Gulbransen Company