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The Old Patent Office Building is a historic building in Washington, D.C. that covers an entire city block between F and G Streets and 7th and 9th Streets NW in the Penn Quarter section of Chinatown. Built 1836–1867 in the Greek Revival style, the building first served as one of the earliest U.S. Patent Office buildings.
Aquia Creek sandstone is a brown to light-gray freestone used extensively in building construction in Washington, D.C. in the late 18th and early 19th centuries. Quarried at Aquia Creek in Stafford County, Virginia , the stone was valuable for its ease of shaping and the quarry's proximity to the tidewater portion of the Potomac River , 45 ...
In 1944, Page applied "Improvement to Toy Building Blocks" as an addition to the previous patent, in which he describes a building system based on rectangular hollow blocks with 2X4 studs on top enabling the construction of walls with staggered rows and window openings. The addition was granted in 1947 as British Patent Nº 587,206.
A Lego clone is a line or brand of children's construction blocks which is mechanically compatible with Lego brand blocks, but is produced by another manufacturer. The blocks were originally patented by The Lego Group in 1961 as "toy building bricks", [1] and the company has since remained dominant in this market. [2]
The National Portrait Gallery occupies a portion of the Old Patent Office Building, a National Historic Landmark. The building is located just south of Chinatown in downtown Washington. Constructed between 1836 and 1867, [68] the building has a sandstone and marble façade, [69] and porticoes modeled after the Parthenon. [70]
Seven-year-old Matthew Sleman of Monroe was recognized by the U.S. Patent and Trademark Office for being one of the youngest patent holders in the country. He invented aquabricks, a color-changing ...
The Lego Group's Duplo product line was introduced in 1969 and is a range of blocks whose lengths measure twice the width, height, and depth of standard Lego blocks and are aimed towards younger children. [21] [27] In 1978, Lego produced the first minifigures, which have since become a staple in most sets. [28]
Read more The post 10 Old Tech Gadgets Worth a Pretty Penny Today appeared first on Wealth Gang. trumzz/istockphotoDust off those old electronics hiding in the attic, because they could be worth a ...
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