No definitions found for 'quadruplex telegraphy'
Perhaps one of these:
quadrivalent,
quadrifurcated,
quadruplication,
quadruplicate,
quadriphonic system,
quadrivalvular,
quadriphonic,
quadriphyllous,
quadruple,
quadripennate,
quadrifoil,
quadripartite,
quadripartition,
quadriplegic,
quadruple bucky,
quadraphony,
quadrivalence,
quadrupled,
quadruple time,
quadrible,
quadrifarious,
quadruped,
quadripara,
quadruplet,
quatrefoil,
quadruplane,
quadrivalve,
quadrable,
quadruplicating,
quadruplicated,
quadripartitely,
quadrivial,
quadrupedal,
quadruplex system,
quadrifoliate,
quatrefeuille,
quadraphonic system,
quadraphonic,
quadruply,
quadrifid,
quadrivium,
quadribasic,
quadriplegia,
quadrupling,
quatuorvir,
quadruplex,
qatar peninsula