Improvements in temperature regulation systems of general application in electrical heating appliances (Machine-translation by Google Translate, not legally binding)
ES454924A1
Improvements introduced in the printed circuit manufacturing processes. (Machine-translation by Google Translate, not legally binding)
ES446429A1
Improvements introduced in the manufacture of printed circuits. (Machine-translation by Google Translate, not legally binding)
ES445335A1
Perfected procedure for the manufacture of printed circuit plates for heating and similar appliances. (Machine-translation by Google Translate, not legally binding)
ES442598A1
Improvements introduced in the heating plates. (Machine-translation by Google Translate, not legally binding)
GB1376909A
Manufacturing process for printed electric circuits
