IT973544B - IMPROVEMENT IN KEYBOARDS FOR ELECTRONIC CALCULATORS - Google Patents

IMPROVEMENT IN KEYBOARDS FOR ELECTRONIC CALCULATORS

Info

Publication number
IT973544B
IT973544B IT54014/72A IT5401472A IT973544B IT 973544 B IT973544 B IT 973544B IT 54014/72 A IT54014/72 A IT 54014/72A IT 5401472 A IT5401472 A IT 5401472A IT 973544 B IT973544 B IT 973544B
Authority
IT
Italy
Prior art keywords
keyboards
improvement
electronic calculators
calculators
electronic
Prior art date
Application number
IT54014/72A
Other languages
Italian (it)
Original Assignee
Philips Nv
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 by Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of IT973544B publication Critical patent/IT973544B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/003—Phantom keys detection and prevention

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Electronic Switches (AREA)
IT54014/72A 1971-11-17 1972-11-14 IMPROVEMENT IN KEYBOARDS FOR ELECTRONIC CALCULATORS IT973544B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7115804,A NL170895C (en) 1971-11-17 1971-11-17 KEYBOARD WITH CYCLIC QUESTIONER.

Publications (1)

Publication Number Publication Date
IT973544B true IT973544B (en) 1974-06-10

Family

ID=19814496

Family Applications (1)

Application Number Title Priority Date Filing Date
IT54014/72A IT973544B (en) 1971-11-17 1972-11-14 IMPROVEMENT IN KEYBOARDS FOR ELECTRONIC CALCULATORS

Country Status (10)

Country Link
US (1) US3778818A (en)
JP (1) JPS538455B2 (en)
BE (1) BE791475A (en)
CA (1) CA973805A (en)
DE (1) DE2255372C3 (en)
FR (1) FR2161660A5 (en)
GB (1) GB1410811A (en)
IT (1) IT973544B (en)
NL (1) NL170895C (en)
SE (1) SE385986B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096935A (en) * 1974-02-22 1978-06-27 Canon Kabushiki Kaisha Input device
JPS5535679U (en) * 1978-08-31 1980-03-07
FR2447089A1 (en) * 1979-01-17 1980-08-14 Serras Paulet Edouard KEY CONTROL KEYBOARD AND MECHANICAL SWITCHES
FR2449388A1 (en) * 1979-02-13 1980-09-12 Cii Honeywell Bull Entry system for coded data into data processing system - employs electronic keyboard containing memory and coding cells, which are clocked by pulse generator
EP0095023A3 (en) * 1982-05-20 1985-04-10 International Business Machines Corporation Contact keyboard with finger controlled n-key rollover
US4500169A (en) * 1982-07-13 1985-02-19 Donnelly John H Cosmetic and observer line of sight mirror

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5035372B1 (en) * 1970-03-26 1975-11-15

Also Published As

Publication number Publication date
FR2161660A5 (en) 1973-07-06
BE791475A (en) 1973-05-16
DE2255372B2 (en) 1977-10-13
JPS538455B2 (en) 1978-03-29
DE2255372C3 (en) 1978-06-08
US3778818A (en) 1973-12-11
DE2255372A1 (en) 1973-05-24
NL170895B (en) 1982-08-02
CA973805A (en) 1975-09-02
NL170895C (en) 1983-01-03
GB1410811A (en) 1975-10-22
NL7115804A (en) 1973-05-21
JPS4858922A (en) 1973-08-18
SE385986B (en) 1976-07-26

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