Note 580 — Chapter XXI · OTHER TECHNOLOGICAL USES OF THE CERIUM AND YTTRIUM ELEMENTS, ZIRCONIUM AND THORIUM
Reading edition
Rickmann and Rappe, D. R. P. 99165, September, 1898; also D. R. P. 203773, October, 1908.
Reading edition
Rickmann and Rappe, D. R. P. 99165, September, 1898; also D. R. P. 203773, October, 1908.