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FR661820A - Improvements in telegraphy and cordless telephony devices - Google Patents

Improvements in telegraphy and cordless telephony devices

Info

Publication number
FR661820A
FR661820A FR661820DA FR661820A FR 661820 A FR661820 A FR 661820A FR 661820D A FR661820D A FR 661820DA FR 661820 A FR661820 A FR 661820A
Authority
FR
France
Prior art keywords
telegraphy
telephony devices
cordless telephony
cordless
devices
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Jules Courtier
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR661820A publication Critical patent/FR661820A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/18—Tubes with a single discharge path having magnetic control means; having both magnetic and electrostatic control means
FR661820D 1928-01-23 1928-01-23 Improvements in telegraphy and cordless telephony devices Expired FR661820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR661820T 1928-01-23

Publications (1)

Publication Number Publication Date
FR661820A true FR661820A (en) 1929-07-30

Family

ID=9011101

Family Applications (1)

Application Number Title Priority Date Filing Date
FR661820D Expired FR661820A (en) 1928-01-23 1928-01-23 Improvements in telegraphy and cordless telephony devices

Country Status (1)

Country Link
FR (1) FR661820A (en)

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