Sound reproducing using optical media

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molecular communication - wikipedia molecular communication from wikipedia, the free encyclopedia jump to navigation jump to search molecular communications systems use the presence or absence of a selected type of molecule to digitally encode messages. [ ] the molecules are delivered into communications media

such as air and water for transmission. the technique also is not subject to the requirement of using antennas that are sized to a specific ratio of the wavelength of the signal. molecular communication signals can be made biocompatible and require very little energy [ ] [ ] . contents nature alcohol...

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

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[n ] bell considered his invention an intrusion on his real work as a scientist and refused to have a telephone in his study. [ ] [n ] many other inventions marked bell's later life, including groundbreaking work in optical telecommunications , hydrofoils , and aeronautics . although bell was not one

magazine while serving as the second president from january , , until . [ ] beyond his scientific work, bell was an advocate of compulsory sterilization , and served as chairman or president of several eugenics organizations. [ ] contents early life first invention education first experiments with sound...

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

power supplies | blackmore it add selected products to basket please select products you wish to purchase using the tick boxes, and specify the quantities required. once your happy with your selection click the add to basket button. view comparisons clear all comparisons order id email address* tel no

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time indicating subclass , , and ; indicating by acoustic means subclass ; indicating time by means other than acoustic or optical or by a combination of means subclass ; acoustic time signals produced electrically subclass ; coin-freed alarm clocks g f / b; acoustic signalling means g b / ) [g b /

and electromechanical displays [g c / v] (class / ) by electric lamps [g c / ] (class / ) producing optical time signals at prefixed times by electric means [g c / ] (class / ) by electric lamps [g c / ] (class / ) by indicating members moved electrically, e.g., flap, band, etc....

https://patents.justia.com/patents-by-us-classification/968

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navigation jump to search switched network of teleprinters this article is about the teleprinter network. for other uses, see telex (disambiguation) . a teletype model used for telex service the telex network was a customer-to-customer switched network of teleprinters similar to a telephone network , using

exchanges were built in the s. teleprinters evolved from telegraph systems, and, like the telegraph, they used binary signals , with symbols represented by the presence or absence of a certain level of electric current. this differs from the analog telephone system, which used varying voltage to represent sound...

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

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anemometers anemometer dimensional borescopes calipers co-ordinate measuring machine coating thickness gauges depth gauges feeler gauges gauge block granite surface plate hardness and surface testers height gauge hole and slot gauges indicators laser distance meter micrometer micrometer heads microscopes optical

detectors combustion gas analyzer emissions analyzer indoor air quality multi-gas detectors safety single gas detector humidity heat stress meter humidity calibration kit humidity calibrator humidity transmitters hygrometers moisture meter psychrometer recorders and data loggers luxmeter refractometers sound...

https://www.generaltech.ae/product/air-monitoring-anemometers/anemometer