BE457637A - - Google Patents
Info
- Publication number
- BE457637A BE457637A BE457637DA BE457637A BE 457637 A BE457637 A BE 457637A BE 457637D A BE457637D A BE 457637DA BE 457637 A BE457637 A BE 457637A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L13/02—Scraping
- A47L13/04—Scraping with steel wool
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L13/02—Scraping
- A47L13/06—Scraping with wire brushes or wire meshes
- A47L13/07—Metal sponges
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US912744XA | 1941-07-23 | 1941-07-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE457637A true BE457637A (de) | 1944-10-31 |
Family
ID=22226942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE457637D BE457637A (de) | 1941-07-23 | 1944-09-25 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE457637A (de) |
| FR (2) | FR912774A (de) |
-
1944
- 1944-09-25 BE BE457637D patent/BE457637A/xx unknown
-
1945
- 1945-07-25 FR FR912774D patent/FR912774A/fr not_active Expired
- 1945-07-25 FR FR912744D patent/FR912744A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR912744A (fr) | 1946-08-19 |
| FR912774A (fr) | 1946-08-20 |