FR742855A - - Google Patents
Info
- Publication number
- FR742855A FR742855A FR742855DA FR742855A FR 742855 A FR742855 A FR 742855A FR 742855D A FR742855D A FR 742855DA FR 742855 A FR742855 A FR 742855A
- 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/34—Means for automatic focusing therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Publications (1)
Publication Number | Publication Date |
---|---|
FR742855A true FR742855A (en) | 1933-03-18 |
Family
ID=1547196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR742855D Expired FR742855A (en) |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR742855A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE767750C (en) * | 1933-02-28 | 1953-07-06 | Rca Corp | Circuit arrangement for re-introducing the average image brightness in television receivers with a Braunschweig tube |
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0
- FR FR742855D patent/FR742855A/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE767750C (en) * | 1933-02-28 | 1953-07-06 | Rca Corp | Circuit arrangement for re-introducing the average image brightness in television receivers with a Braunschweig tube |