 Complete the following phrase:  Robert Wornum  Sons exhibited cottage and grand pianos as well as their folding square at the 1862 International Exhibition in London, receiving a medal for novelty of invention in pianoone of almost seventy piano manufacturers to receive a prize medal including Broadwood, L. Boesendorfer of Vienna, Pleyel, Wolff  Cie, Paris, and Steinway  Sons, New York. They exhibited a piccolo upright, as well as moderately priced downstriking grand and square pianos without metal bracings at the 1867 