| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53100066A | 1966-03-01 | 1966-03-01 |
| Publication Number | Publication Date |
|---|---|
| BE694799Atrue BE694799A (en) | 1967-08-28 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE694799DBE694799A (en) | 1966-03-01 | 1967-02-28 |
| Country | Link |
|---|---|
| US (1) | US3466649A (en) |
| BE (1) | BE694799A (en) |
| CH (1) | CH457202A (en) |
| DE (1) | DE1566699A1 (en) |
| FR (1) | FR1512885A (en) |
| GB (1) | GB1180444A (en) |
| SE (1) | SE340773B (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3623086A (en)* | 1968-11-06 | 1971-11-23 | Schulmerich Mfg Co | Solid state control system for striking bells |
| GB1412457A (en)* | 1971-12-27 | 1975-11-05 | Sumitomo Electric Industries | Sound generator comprising a piezoelectric acoustic device |
| US3872470A (en)* | 1973-04-18 | 1975-03-18 | Airco Inc | Audible signal generating apparatus having selectively controlled audible output |
| US4078209A (en)* | 1977-03-11 | 1978-03-07 | International Telephone And Telegraph Corporation | Sound communication system with speaker protection for frequencies below a predetermined minimum |
| US4151520A (en)* | 1977-07-25 | 1979-04-24 | Full Elliott D | Portable self-contained alarm with remote triggering capability |
| DE2931437C2 (en)* | 1979-08-02 | 1981-09-24 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for controlling a signal loudspeaker |
| GB2151057A (en)* | 1983-11-17 | 1985-07-10 | Sakis Roy | Alarm device |
| GB2238412A (en)* | 1989-11-21 | 1991-05-29 | Richard Bone | Exit signalling device |
| US5293155A (en)* | 1990-05-07 | 1994-03-08 | Wheelock Inc. | Interface for a supervised multi-input audible warning system |
| CN206585662U (en)* | 2016-03-15 | 2017-10-24 | Bot家庭自动化公司 | Audio/Video Recording and Communications Doorbell |
| IT202200020319A1 (en)* | 2022-10-03 | 2024-04-03 | Vimar Spa | SOUND DEVICE FOR ELECTRICAL SYSTEMS |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2455472A (en)* | 1945-04-10 | 1948-12-07 | Bell Telephone Labor Inc | Method and system for electronically generating complex signals |
| US3196432A (en)* | 1960-09-01 | 1965-07-20 | Winston E Kock | Transistorized door annunciator utilizing capacitor discharge |
| US3114114A (en)* | 1960-11-09 | 1963-12-10 | Robert R Atherton | Voltage controlled ramp and pulse generator |
| US3183454A (en)* | 1961-04-24 | 1965-05-11 | Autophon Ag | Circuit for providing sequences of pulses and intervals |
| US3210686A (en)* | 1963-05-03 | 1965-10-05 | Teletype Corp | Unijunction oscillator with plural outputs depending on input control |
| Publication number | Publication date |
|---|---|
| FR1512885A (en) | 1968-02-09 |
| SE340773B (en) | 1971-11-29 |
| US3466649A (en) | 1969-09-09 |
| CH457202A (en) | 1968-05-31 |
| DE1566699A1 (en) | 1970-04-30 |
| GB1180444A (en) | 1970-02-04 |