explication du phonopore, se rapportant plus spécialement au télégraphe phonopore simplex.
Subtitle: An explanation of the phonopore, and more especially the simplex phonopore telegraph.  With reports on the phonopore system and instruments by Latimer Clark [and others]
Publisher: K. Paul, Trench, Trübner
Published: 1891
Place of publication: London
Language: fre
Number of pages: 68
Subjects: Telegraph -- History
Other titles: Phonopore; Simplex Phonopore Telegraph