Electrical apparatus

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balances barometers calipers colorimeters conductivity data loggers electrical electrodes electroporation flash point testers force gages hydrometers hygrometers leakage detectors magnetic field testers melting point apparatus mercury analyzers metal testing meters microscopes moisture determination...

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(rf currents) have special properties not shared by direct current or alternating current of lower frequencies. energy from rf currents in conductors can radiate into space as electromagnetic waves ( radio waves ). this is the basis of radio technology. rf current does not penetrate deeply into electrical

circuits. the mos integrated circuit is the technology behind the current proliferation of radio frequency wireless telecommunications devices such as cellphones . medicine[ edit ] main article: medical applications of radio frequency radio frequency (rf) energy, in the form of radiating waves or electrical...

https://en.wikipedia.org/wiki/Radio-frequency

meters power analyzers testing instruments home power analyzers digital power analyzer "sigma dpa- " digital power analyzer "sigma dpa- " quick overview digital power analyzer/ digital multifunctional meter is used to measure voltage, current, wattage, apparant power, frequency, power factor of any electrical

industrial maintanance, production, quality.. additional information model : dpa- in stock manufactured by : sigma rs. , . qty : add to cart description digital power analyzer/ digital multifunctional meter is used to measure voltage, current, wattage, apparant power, frequency, power factor of any electrical...

http://www.sigmainstruments.com/digital-power-analyzer-sigma-dpa-p-26.html

produced strip or web (class / ) method (class / ) buckle making (class / ) button-fastener making (class / ) shredding metal or metal wool article making (class / ) metal wool making (class / ) metal wool bundling (class / ) cord heddle making (class / ) cotter-pin making (class / ) crankshaft making apparatus

(class / ) toothed-cylinder making apparatus (e.g., texture working cylinder) (class / ) impeller making apparatus (class / ) type finishing and grooving (class / ) venetian blind assembling (class / ) umbrella-frame making (class / ) barrier layer or semiconductor device making (class / ) barrier layer...

https://patents.justia.com/patents-by-us-classification/29

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electronics and it products consumer electronics and it audio-video products communication products power supply products computer computer spare parts computer peripherals computer network equipment computer software business automation equipment other consumer electronics and it products electronic and electrical...

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leather more clothing & accessories computer port computers more computer & accessories flooring packing stainless-steel more construction & decoration materials display battery screen more consumer electronic products paper container garden more household & kitchen aid copper electronic cable more electrical

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compressed shape making (class / ) packing or bundling (class / ) turret type (class / ) continuous sheet type (class / ) with cutting (class / ) molds (class / ) tobacco treatment (class / ) puffing (class / ) extraction of component, other than moisture, by contact with diverse medium (class / ) with electrical

retainer or means to prevent or retard burning (class / ) with means to pierce or protect cigar end structure (class / ) with means to facilitate ignition (class / ) compositions, e.g., smoking or chewing mixture or medium (class / ) cigar or cigarette (class / ) plug tobacco (class / ) method or apparatus...

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stereoscope (a device for displaying three-dimensional images), and the playfair cipher (an encryption technique). however, wheatstone is best known for his contributions in the development of the wheatstone bridge , originally invented by samuel hunter christie , which is used to measure an unknown electrical

of telegraphy . contents life music instruments and acoustics velocity of electricity spectroscopy telegraph cooperation with cooke early installations public attention and success differences with cooke further work on telegraphs optics measuring time polar clock wheatstone bridge cryptography electrical...

https://en.wikipedia.org/wiki/Charles_Wheatstone