DE190097C - - Google Patents
Info
- Publication number
- DE190097C DE190097C DENDAT190097D DE190097DA DE190097C DE 190097 C DE190097 C DE 190097C DE NDAT190097 D DENDAT190097 D DE NDAT190097D DE 190097D A DE190097D A DE 190097DA DE 190097 C DE190097 C DE 190097C
- Authority
- DE
- Germany
- Prior art keywords
- microphone
- button
- telephone
- lock
- inductor
- 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.)
- Active
Links
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 241000947840 Alteromonadales Species 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/667—Preventing unauthorised calls from a telephone set
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE190097C true DE190097C (forum.php) |
Family
ID=453585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT190097D Active DE190097C (forum.php) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE190097C (forum.php) |
-
0
- DE DENDAT190097D patent/DE190097C/de active Active
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