. . "Verenigde Staten" . . "Électrotechnique." . . "Elektroteknik." . . "Gloeilampen" . . "Quelle." . . "Telefonie" . . . . "The papers of Thomas A. Edison / Vol. 5, Research to development at Menlo Park : January 1879 - March 1881 / vol. eds. Paul B. Israel ... [et al.]" . . . . . . "The papers of Thomas A. Edison / Vol. 5, Research to development at Menlo Park : January 1879-March 1881 / vol. ed.: Paul B. Israel ... [et al.] ; ed. staff: Lindsay Frederick Braun, Grace Kurkowski" . "The papers of Thomas A. Edison. Vol. 5, Research to development at Menlo Park : January 1879-March 1881" . . . "Verzamelde werken (vorm)" . . . . "Papers / 5 Research to development at Menlo Park : January 1879 - March 1881" . . . .