Bijl, H. J. Van Der .
The thermionic vacuum tube and its applications / by H. J. Van Der Bijl. - New York : McGraw-Hill Book, 1920.
537.53 / BIT
The thermionic vacuum tube and its applications / by H. J. Van Der Bijl. - New York : McGraw-Hill Book, 1920.
537.53 / BIT