NL146431B - Toetsenbord met toetsen van doorschijnend materiaal. - Google Patents

Toetsenbord met toetsen van doorschijnend materiaal.

Info

Publication number
NL146431B
NL146431B NL676700483A NL146431DA NL146431B NL 146431 B NL146431 B NL 146431B NL 676700483 A NL676700483 A NL 676700483A NL 146431D A NL146431D A NL 146431DA NL 146431 B NL146431 B NL 146431B
Authority
NL
Netherlands
Prior art keywords
keyboard
translucent material
keys made
keys
translucent
Prior art date
Application number
NL676700483A
Other languages
English (en)
Original Assignee
Wirth
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.)
Publication of NL146431B publication Critical patent/NL146431B/nl

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
    • H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
    • H01J25/58—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode having a number of resonators; having a composite resonator, e.g. a helix
NL676700483A 1949-05-13 Toetsenbord met toetsen van doorschijnend materiaal. NL146431B (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL283560X 1949-05-13

Publications (1)

Publication Number Publication Date
NL146431B true NL146431B (nl)

Family

ID=19782400

Family Applications (2)

Application Number Title Priority Date Filing Date
NL71310D NL71310C (nl) 1949-05-13
NL676700483A NL146431B (nl) 1949-05-13 Toetsenbord met toetsen van doorschijnend materiaal.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
NL71310D NL71310C (nl) 1949-05-13

Country Status (7)

Country Link
US (1) US2659030A (nl)
BE (1) BE495667A (nl)
CH (1) CH283560A (nl)
DE (1) DE820940C (nl)
FR (1) FR1017426A (nl)
GB (1) GB676914A (nl)
NL (2) NL146431B (nl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313343A (en) * 1996-05-20 1997-11-26 Reuters Ltd A keyboard having keycaps with transparent front faces

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE426053C (de) * 1926-03-08 Siemens & Halske Akt Ges Entladungsroehre
US1417912A (en) * 1916-06-24 1922-05-30 Hewitt Peter Cooper Vacuum electric apparatus
GB344448A (en) * 1929-12-03 1931-03-03 Andre Gabriel Clavier Improvements in or relating to thermionic oscillation generators
US2009369A (en) * 1931-06-24 1935-07-23 Rca Corp Oscillation generation
DE663309C (de) * 1934-10-30 1938-08-04 Telefunken Gmbh Kurzwellenroehre mit Kathode und konzentrisch dazu angeordneter einteiliger Anode
US2266411A (en) * 1938-05-27 1941-12-16 Int Standard Electric Corp Electron tube
FR999345A (nl) * 1946-11-20 1952-01-29

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313343A (en) * 1996-05-20 1997-11-26 Reuters Ltd A keyboard having keycaps with transparent front faces

Also Published As

Publication number Publication date
DE820940C (de) 1951-11-15
BE495667A (nl)
CH283560A (de) 1952-06-15
GB676914A (en) 1952-08-06
NL71310C (nl)
FR1017426A (fr) 1952-12-10
US2659030A (en) 1953-11-10

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