Note 560 — Chapter XXI · OTHER TECHNOLOGICAL USES OF THE CERIUM AND YTTRIUM ELEMENTS, ZIRCONIUM AND THORIUM
Reading edition
Vide Kuzel and Wedekind, E. 23215, 1909.
[561] Electrodon Gesellschaft, D. R. P. 154691, September, 1904.
Reading edition
Vide Kuzel and Wedekind, E. 23215, 1909.
[561] Electrodon Gesellschaft, D. R. P. 154691, September, 1904.