FR559589A - - Google Patents
Info
- Publication number
- FR559589A FR559589A FR559589DA FR559589A FR 559589 A FR559589 A FR 559589A FR 559589D A FR559589D A FR 559589DA FR 559589 A FR559589 A FR 559589A
- Authority
- FR
- France
- 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
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
- G09B29/10—Map spot or coordinate position indicators; Map reading aids
-
- 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
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
- Transmission Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE190475X | 1921-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR559589A true FR559589A (da) | 1923-09-18 |
Family
ID=20304585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR559589D Expired FR559589A (da) | 1921-12-13 |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR559589A (da) |
| GB (1) | GB190475A (da) |
| NL (1) | NL23377C (da) |
-
0
- NL NL23377D patent/NL23377C/xx active
- FR FR559589D patent/FR559589A/fr not_active Expired
-
1922
- 1922-12-07 GB GB33457/22A patent/GB190475A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB190475A (en) | 1923-11-15 |
| NL23377C (da) |