Method of preventing unauthorized duplication of an optical disc by authentification of a physical parameter, manufacturing process of such an optical disc and an optical disc thus obtained
FR2645673A1
ASBESTOS-FREE FILTER CANDLE FOR FILTERING HOT RADIOACTIVE GASES
US1233926A
Process for the manufacture of aluminum nitrid.
GB101091A
Process for the Manufacture of Aluminium Nitride.
GB191511271A
Process and Apparatus for the Manufacture of Aluminium Nitride.
US1212119A
Process of producing aluminium nitrid.
US1196657A
Process for the fixation of nitrogen by means of ferro-aluminium.
GB191504287A
Improvement in Processes for the Fixation of Nitrogen by means of Ferro-aluminium.
US1143482A
Process of manufacture of aluminium nitrid.
GB191424533A
Process of Manufacture of Aluminium Nitride.
US1145748A
Electric furnace.
US1196639A
Process of fixation of nitrogen.
CA174685A
Nitrogen fixation
GB191422586A
Process of Fixation of Nitrogen.
US1217842A
Process of carrying out chemical reactions.
US1155840A
Process of fixing nitrogen.
CA194796A
Nitrogen process
US1198965A
Process for fixing nitrogen by means of ferro-aluminium or other ferro-alloys.
GB191328071A
Process for the Fixation of Nitrogen by Means of Ferro-aluminium or other Ferro Compounds.
GB191327971A
Process for Fixing Nitrogen by Means of Ferro-aluminium.