FR490640A - Testing device for 90 ° square - Google Patents
Testing device for 90 ° squareInfo
- Publication number
- FR490640A FR490640A FR490640DA FR490640A FR 490640 A FR490640 A FR 490640A FR 490640D A FR490640D A FR 490640DA FR 490640 A FR490640 A FR 490640A
- Authority
- FR
- France
- Prior art keywords
- square
- testing device
- testing
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/02—Magnetic compasses
- G01C17/04—Magnetic compasses with north-seeking magnetic elements, e.g. needles
- G01C17/10—Comparing observed direction with north indication
- G01C17/12—Comparing observed direction with north indication by sighting means, e.g. for surveyors' compasses
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR490640T | 1917-12-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR490640A true FR490640A (en) | 1919-05-01 |
Family
ID=1526742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR490640D Expired FR490640A (en) | 1917-12-26 | 1917-12-26 | Testing device for 90 ° square |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR490640A (en) |
-
1917
- 1917-12-26 FR FR490640D patent/FR490640A/en not_active Expired
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