JPH03120268U - - Google Patents

Info

Publication number
JPH03120268U
JPH03120268U JP2869190U JP2869190U JPH03120268U JP H03120268 U JPH03120268 U JP H03120268U JP 2869190 U JP2869190 U JP 2869190U JP 2869190 U JP2869190 U JP 2869190U JP H03120268 U JPH03120268 U JP H03120268U
Authority
JP
Japan
Prior art keywords
transducer
signal
abnormality
reflector
ultrasonic waves
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.)
Pending
Application number
JP2869190U
Other languages
English (en)
Japanese (ja)
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
Priority to JP2869190U priority Critical patent/JPH03120268U/ja
Publication of JPH03120268U publication Critical patent/JPH03120268U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Alarm Devices (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
JP2869190U 1990-03-20 1990-03-20 Pending JPH03120268U (enExample)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2869190U JPH03120268U (enExample) 1990-03-20 1990-03-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2869190U JPH03120268U (enExample) 1990-03-20 1990-03-20

Publications (1)

Publication Number Publication Date
JPH03120268U true JPH03120268U (enExample) 1991-12-10

Family

ID=31531484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2869190U Pending JPH03120268U (enExample) 1990-03-20 1990-03-20

Country Status (1)

Country Link
JP (1) JPH03120268U (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000043728A (ja) * 1998-07-29 2000-02-15 Railway Technical Res Inst 通行異常検知装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5068290A (enExample) * 1973-10-17 1975-06-07
JPS50153893A (enExample) * 1974-05-31 1975-12-11

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5068290A (enExample) * 1973-10-17 1975-06-07
JPS50153893A (enExample) * 1974-05-31 1975-12-11

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000043728A (ja) * 1998-07-29 2000-02-15 Railway Technical Res Inst 通行異常検知装置

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