DISRAELI DOCUMENTS
see also French Patent # 763,536 - Rivierre 1933
see also French Patent # 763,536 - Rivierre 1933
see also French Patent # 780,238 - Rivierre 1934
see also French Patent # 780,238 - Rivierre 1934
see also French Patent # 796,708 - Rivierre 1935
see also French Patent # 796,708 - Rivierre 1935