Eric Walker added James Watt - Wikipedia to James Watt

Eric Walker added ScienceDirect to James Watt and Patents and patent law

Eric Walker added a number of topics and Wintergatan - Marble Machine (music instrument using 2000 marbles) to Inventors, and added Inventors to People

Eric Walker added James Watt - Wikipedia and ScienceDirect to James Watt, and added James Watt to Inventors