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2. P. Eisler,The Technology of Printed Circuit (London: Heywood, 1962), pp. 223–231.
3. MR. Hills, “The Electrolytic Regeneration of Spent Ferric Chloride Etchant,”Trans. IMF, 57 (1979), p. 73.
4. Technical Report of Tristar, Methuen, Massachusetts.
5. Technical Report of Tristar, Methuen, Massachusetts.