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