CA950425A - Keyboard locking device - Google Patents

Keyboard locking device

Info

Publication number
CA950425A
CA950425A CA144,730,A CA144730A CA950425A CA 950425 A CA950425 A CA 950425A CA 144730 A CA144730 A CA 144730A CA 950425 A CA950425 A CA 950425A
Authority
CA
Canada
Prior art keywords
locking device
keyboard locking
keyboard
locking
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
CA144,730,A
Other languages
English (en)
Other versions
CA144730S (en
Inventor
Kazuhiko Ikeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Cash Register Co
Original Assignee
National Cash Register Co
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 National Cash Register Co filed Critical National Cash Register Co
Application granted granted Critical
Publication of CA950425A publication Critical patent/CA950425A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06C—DIGITAL COMPUTERS IN WHICH ALL THE COMPUTATION IS EFFECTED MECHANICALLY
    • G06C7/00—Input mechanisms
    • G06C7/02—Keyboards
    • G06C7/04—Interlocking devices, e.g. between keys

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Cash Registers Or Receiving Machines (AREA)
  • Lock And Its Accessories (AREA)
CA144,730,A 1971-09-01 1972-06-14 Keyboard locking device Expired CA950425A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17700571A 1971-09-01 1971-09-01

Publications (1)

Publication Number Publication Date
CA950425A true CA950425A (en) 1974-07-02

Family

ID=22646789

Family Applications (1)

Application Number Title Priority Date Filing Date
CA144,730,A Expired CA950425A (en) 1971-09-01 1972-06-14 Keyboard locking device

Country Status (4)

Country Link
US (1) US3703987A (enrdf_load_stackoverflow)
JP (1) JPS4833895A (enrdf_load_stackoverflow)
CA (1) CA950425A (enrdf_load_stackoverflow)
GB (1) GB1366732A (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548049B1 (enrdf_load_stackoverflow) * 1971-03-12 1979-04-12
JPS5864537A (ja) * 1981-10-13 1983-04-16 Casio Comput Co Ltd 電子レジスタ
US6768428B1 (en) 2002-03-27 2004-07-27 Blaine C. Readler Computer keyboard lock
US8522309B2 (en) * 2007-01-22 2013-08-27 Simon Yoffe Security switch
US8090961B2 (en) * 2007-01-22 2012-01-03 Simon Yoffe Security switch
WO2020006477A1 (en) 2018-06-29 2020-01-02 Purism Electronic kill and physical cover switch

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210065A (en) * 1940-08-06 Cash register
US2280958A (en) * 1942-04-28 Cash register
US3464623A (en) * 1964-08-11 1969-09-02 Sperry Rand Corp Control mechanism for calculating machine
US3516604A (en) * 1968-01-10 1970-06-23 Ibm Sequential keyboard interlock

Also Published As

Publication number Publication date
JPS4833895A (enrdf_load_stackoverflow) 1973-05-14
GB1366732A (enrdf_load_stackoverflow) 1974-09-11
US3703987A (en) 1972-11-28

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