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Dyfyniad Arddull Chicago.Parr, E. A., E.A .Parr, Bsc, and C. .Eng. Industrial Control Handbook. Oxford, England ; Boston : New York: Newnes ; Available in North America from Industrial Press, 1998.
Dyfyniad MLA.Parr, E. A., et al. Industrial Control Handbook. Newnes ; Available in North America from Industrial Press, 1998.
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