GB 639178, Eisler, Paul & Strong, Harold Vezey, "Manufacture of electric circuits and circuit components", published 1950-06-21
GB 639111, Strong, Harold Vezey & Eisler, Paul, "Manufacture of electric circuits and circuit components", published 1950-06-21, assigned to Technograph Printed Circuits Ltd.
GB 639179, Strong, Harold Vezey & Eisler, Paul, "Manufacture of electric circuits and circuit components", published 1950-06-21