AU1792420A - Improvements in or relating to sirens, or warning horns - Google Patents

Improvements in or relating to sirens, or warning horns

Info

Publication number
AU1792420A
AU1792420A AU17924/20A AU1792420A AU1792420A AU 1792420 A AU1792420 A AU 1792420A AU 17924/20 A AU17924/20 A AU 17924/20A AU 1792420 A AU1792420 A AU 1792420A AU 1792420 A AU1792420 A AU 1792420A
Authority
AU
Australia
Prior art keywords
sirens
relating
warning horns
horns
warning
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
AU17924/20A
Inventor
Sven Albert Rydberg Helge
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.)
Individual
Original Assignee
Individual
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of AU1792420A publication Critical patent/AU1792420A/en
Expired legal-status Critical Current

Links

AU17924/20A 1920-09-24 Improvements in or relating to sirens, or warning horns Expired AU1792420A (en)

Publications (1)

Publication Number Publication Date
AU1792420A true AU1792420A (en) 1921-04-19

Family

ID=

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