JPS539199Y2 - - Google Patents
Info
- Publication number
- JPS539199Y2 JPS539199Y2 JP4180175U JP4180175U JPS539199Y2 JP S539199 Y2 JPS539199 Y2 JP S539199Y2 JP 4180175 U JP4180175 U JP 4180175U JP 4180175 U JP4180175 U JP 4180175U JP S539199 Y2 JPS539199 Y2 JP S539199Y2
- Authority
- JP
- Japan
- 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
Links
Landscapes
- Respiratory Apparatuses And Protective Means (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4180175U JPS539199Y2 (https=) | 1975-03-28 | 1975-03-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4180175U JPS539199Y2 (https=) | 1975-03-28 | 1975-03-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51123796U JPS51123796U (https=) | 1976-10-06 |
| JPS539199Y2 true JPS539199Y2 (https=) | 1978-03-10 |
Family
ID=28169892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4180175U Expired JPS539199Y2 (https=) | 1975-03-28 | 1975-03-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS539199Y2 (https=) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9517366B2 (en) * | 2013-02-01 | 2016-12-13 | 3M Innovative Properties Company | Respirator mask speech enhancement apparatus and method |
-
1975
- 1975-03-28 JP JP4180175U patent/JPS539199Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51123796U (https=) | 1976-10-06 |