return-circuit tube
51Dustin Rhodes — (as Goldust) signing autographs. Ring name(s) Black Reign[1][2] …
52Cathode bias — In order for a vacuum tube (or valve) to operate in a fairly linear region of its characteristic curve, the grid element must be maintained at a bias voltage more negative than the cathode. This is called cathode bias.Early techniquesEarly… …
53London Underground infrastructure — The infrastructure of the London Underground includes 11 lines, which serve 268 stations by rail. Lines on the Underground can be classified into two types: subsurface and deep level. Lines of both types usually emerge onto the surface outside… …
54Photoconductive atomic force microscopy — (pc AFM) is a scientific technique.. Multi layer photovoltaic cells have gained popularity since mid 1980s.[1] At the time, research was primarily focused on single layer photovoltaic (PV) devices between two electrodes, in which PV properties… …
55TARDIS — The TARDIS used from 2005 to 2010 on display at BBC Television Centre …
56Antonio Meucci — Born 13 April 1808(1808 04 13) Florence, Italy …
57Nortel — Networks Corporation Type Public OTC Markets Group: NRTLQ Industry Telecommunications …
58TWA Flight 800 — For the 1964 crash of a TWA Boeing 707 in Rome, Italy, see TWA Flight 800 (1964). TWA Flight 800 Recovered TWA 800 wreckage Accident summary Date …
59Computer — For other uses, see Computer (disambiguation). Computer technology redirects here. For the company, see Computer Technology Limited. Computer …
60Glossary of fuel cell terms — The Glossary of fuel cell terms lists the definitions of many terms used within the fuel cell industry. The terms in this glossary may be used by fuel cell industry associations, in education material and fuel cell codes and standards to name but …
