海量图书期刊资源，随时随地畅享阅读乐趣
Automatic performance analysis with periscopeM. Gerndt; M. Ott · 2010
Aerial triangulation using the solar periscopeE. Santoni · 1958
Use of Celluloid in Periscope MirrorsLANGLEY, EDWARD M. · Nature · 1915
Periscope1913