ZA893125B - Electromagnetic fire warning system for underground mines - Google Patents

Electromagnetic fire warning system for underground mines

Info

Publication number
ZA893125B
ZA893125B ZA893125A ZA893125A ZA893125B ZA 893125 B ZA893125 B ZA 893125B ZA 893125 A ZA893125 A ZA 893125A ZA 893125 A ZA893125 A ZA 893125A ZA 893125 B ZA893125 B ZA 893125B
Authority
ZA
South Africa
Prior art keywords
warning system
fire warning
underground mines
electromagnetic
electromagnetic fire
Prior art date
Application number
ZA893125A
Inventor
Kenneth E Hjelmstad
E Hjelmstad Kenneth
Original Assignee
Us Interior
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 Us Interior filed Critical Us Interior
Publication of ZA893125B publication Critical patent/ZA893125B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
ZA893125A 1988-05-02 1989-04-27 Electromagnetic fire warning system for underground mines ZA893125B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20123588A 1988-05-02 1988-05-02

Publications (1)

Publication Number Publication Date
ZA893125B true ZA893125B (en) 1990-02-28

Family

ID=22745035

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA893125A ZA893125B (en) 1988-05-02 1989-04-27 Electromagnetic fire warning system for underground mines

Country Status (4)

Country Link
AU (1) AU618088B2 (en)
CA (1) CA1311527C (en)
GB (1) GB2220823A (en)
ZA (1) ZA893125B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8232888B2 (en) 2007-10-25 2012-07-31 Strata Proximity Systems, Llc Interactive magnetic marker field for safety systems and complex proximity warning system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254528A (en) * 1991-03-19 1992-10-07 Axl Systems Ltd Miners lamp communicator
AU2007246164B2 (en) 2006-04-28 2012-12-20 Orica Australia Pty Ltd Methods of controlling components of blasting apparatuses, blasting apparatuses, and components thereof
US7796943B2 (en) 2007-03-28 2010-09-14 Lockheed Martin Corporation Sub-surface communications system and method
US7903041B2 (en) 2008-05-01 2011-03-08 Lockheed Martin Corporation Magnetic antenna apparatus and method for generating a magnetic field
CN113745732B (en) * 2021-09-02 2023-05-30 深圳市德昶科技有限公司 Positioning device based on built-in antenna is applied to mine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1257299A (en) * 1969-04-25 1971-12-15
US3740488A (en) * 1971-01-13 1973-06-19 Westinghouse Electric Corp Inductive loop through-the-earth communication system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8232888B2 (en) 2007-10-25 2012-07-31 Strata Proximity Systems, Llc Interactive magnetic marker field for safety systems and complex proximity warning system
US9466216B2 (en) 2007-10-25 2016-10-11 Strata Safety Products, Llc Proximity detection system and method and collision avoidance system and method using proximity detection
US9898930B2 (en) 2007-10-25 2018-02-20 Strata Safety Products, Llc Proximity detection system and method and collision avoidance system and method using proximity detection
US10170000B2 (en) 2007-10-25 2019-01-01 Strata Safety Products, Llc Proximity detection system and method and collision avoidance system and method using proximity detection
US10467902B2 (en) 2007-10-25 2019-11-05 Strata Safety Products, Llc Proximity detection system and method and collision avoidance system and method using proximity detection
US10769955B2 (en) 2007-10-25 2020-09-08 Strata Safety Products, Llc Proximity detection system and method and collision avoidance system and method using proximity detection
US11380205B2 (en) 2007-10-25 2022-07-05 Strata Safety Products, Llc Proximity detection system and method and collision avoidance system and method using proximity detection
US11790784B2 (en) 2007-10-25 2023-10-17 Strata Safety Products, Llc Proximity detection system and method and collision avoidance system and method using proximity detection

Also Published As

Publication number Publication date
GB8909870D0 (en) 1989-06-14
GB2220823A (en) 1990-01-17
CA1311527C (en) 1992-12-15
AU618088B2 (en) 1991-12-12
AU3388489A (en) 1989-11-02

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