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Ability Engineering Drawing Board is based on Method-Draw, which is copyright of Mark MacKay mark@method.ac and released under the MIT License. Method-Draw can be found here on github.

Ability Engineering's symbols which include "Process Diagram, Electrical, Vessels and Piping Symbols" are copyright Ability Engineering Technology, Inc.

Use of the Ability Engineering Drawing Board is subject to the terms of use of www.abilityengineering.com, which can be found here.

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