NL90453C - - Google Patents
Info
- Publication number
- NL90453C NL90453C NL90453DA NL90453C NL 90453 C NL90453 C NL 90453C NL 90453D A NL90453D A NL 90453DA NL 90453 C NL90453 C NL 90453C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH323473T | 1954-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL90453C true NL90453C (en:Method) |
Family
ID=4499178
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL90453D NL90453C (en:Method) | 1954-08-24 | ||
| NL80046D NL80046C (en:Method) | 1954-08-24 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL80046D NL80046C (en:Method) | 1954-08-24 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE530248A (en:Method) |
| CH (1) | CH323473A (en:Method) |
| NL (2) | NL80046C (en:Method) |
-
0
- NL NL90453D patent/NL90453C/xx active
- NL NL80046D patent/NL80046C/xx active
- BE BE530248D patent/BE530248A/xx unknown
-
1954
- 1954-08-24 CH CH323473D patent/CH323473A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH323473A (de) | 1957-07-31 |
| BE530248A (en:Method) | |
| NL80046C (en:Method) |