Electric filter operating with acoustic waves
Electric four-terminal filter network
Electric frequency filter with piezoelectric crystals
Electric frequency separator
Electric resonant transfer filter
Electric resonator
Electric timepiece
Electric timepiece
Electric transforming arrangement
Electric wave filter
Electric wave filter
Electric wave filter
Electric wave filter
Electric wave filters
Electric wave filters
Electrical and electro-mechanical system employing...
Electrical apparatus connector plugs
Electrical attenuators
Electrical circuit arrangement
Electrical circuit including one or more commutating switches