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Mark Proett and Carroll Gantz are listed as the inventors on the utility and design patents, respectively, assigned to Black & Decker for a cordless vacuum cleaner. [1] [2] Mark Proett was an engineer whose utility patent was for B&D's Model 9321 cordless vacuum cleaner, called the Spot Vac, a component of the Mod 4 series of power tools (shrub ...
A small number of skating robots have been developed, one of which is a multi-mode walking and skating device. It has four legs, with unpowered wheels, which can either step or roll. [ 103 ] Another robot, Plen, can use a miniature skateboard or roller-skates, and skate across a desktop.
1995: Match.com launches as the first dating site ever and is the number 1 most visited dating site in the US. 1995: Waiter.com launches as the first online food ordering service. 1996: The Ciena Corporation , in partnership with Sprint , deployed the first commercial dense wavelength-division multiplexing system, which created the massive ...
Anti-Assad protests in Baniyas, 29 April 2011. Major unrest began on 15 March 2011, when protesters marched in Damascus and Aleppo, demanding democratic reforms and the release of political prisoners, triggered by the arrest of a teenage boy and his friends a few days earlier in the city of Daraa, for writing in graffiti, "It's your turn, doctor". [7]
It was a period from approximately the late 15th century to the 17th century, during which seafarers from a number of European countries explored, colonized, and conquered regions across the globe. The Age of Discovery was a transformative period in world history when previously isolated parts of the world became connected to form the world ...
In addition, it is known that when single-layer graphene is supported on an amorphous material, the thermal conductivity is reduced to about 500 – 600 W⋅m −1 ⋅K −1 at room temperature as a result of scattering of graphene lattice waves by the substrate, [172] [173] and can be even lower for few-layer graphene encased in amorphous ...