"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 7209288 | Snorkel device for a submarine An optical observation device is connected to an extendable and retractable snorkel tube for above-water observation during the snorkel travel (travel at periscope depth) of the submarine. The optical observation device is designed as a compact unit which consists o... | 04/24/2007 |
| 7000561 | Mast device for a submarine The mast device for a submarine comprises a guiding means, a vertically traversable mast guided therein and information means which are provided at the mast upper end and which are in electrical interaction with the inside of the submarine for emitting and receiving... | 02/21/2006 |
| 6907839 | Mast device for a submarine The mast device for a submarine comprises a guiding means, a vertically traversable mast guided therein and information means which are provided at the mast upper end and which are in electrical interaction with the inside of the submarine for emitting and receiving... | 06/21/2005 |
| 5031565 | Two-level sea-land creeping vehicle A two-level sea-land creeping vehicle formed by three main parts: a frustoconical bow portion which is movable independently but connected to the central part or compartment in the form of a drop of water, which is flat in the lower part and which is fixe... | 07/16/1991 |
| 4282617 | Boat hull, material or blank for a boat hull, and a method of producing a boat hull A boat hull is manufactured from a sheet or blank having cut-outs or slots formed therein, such that the blank when folded and when its cut-outs along its edges are mutually connected, a boat hull without a "boxy" shape will be obtained. The cut-outs or s... | 08/11/1981 |