sentences:  He moved the equipment to a small warehouse in Harvard Square, in Cambridge, Massachusetts, where he built research apparatus for professors and researchers of Boston-area medical schools, and produced many inventions over the following years.In 1928, he designed a Barcroft-Warburg apparatus for tissue respiration studies.In 1930, he designed a new type of micromanipulator which was valuable in early physiology studies and later saw use in assembly of electronic components.