Known Names: Beridze-Stakhovsky's generator, Generator "Cerpan"
Development (year): exact date is unknown, original devices were developed before 1982 (Soviet Union). It seems that main development was performed in 70x. This report enlists several performed experiments with "Cerpan" between 1980 and 1992. There are scientific publications with "Cerpan" even now (2004, 2009, see e.g. this paper), however there is no reliable information about replicated devices.
Known Developers: A.A.Beridze-Stakhovsky (1930-1982)
Main Sources: documental film about A.A.Beridze-Stakhovsky
These devices are passive generators, detailed information about their construction is not available. Several sources reported about using "activated crystals" and two (or more) spirals in the generator. These images are taken from the documental firm about A.A.Beridze-Stakhovsky.
These images are from here, authors said three first devices are original denerators, the last one is the replication.