CADSYM is a privately owned business that specializes in the production of symbol libraries designed for the professional user. The symbols were developed by the owner, who is a member of the Ontario Association of Certified Engineering Technicians and Technologists (OACETT). He has accumulated more than 40 years experience in the design and commissioning of Electrical, Hydraulic, and Pneumatic control systems. We welcome any suggestions that would enhance the usefulness of the libraries. The owner is also an avid model steam engine enthusiast and horologist, and machines all the component parts in his well-equipped workshop.