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A calculator watch is a digital watch with a built-in calculator, usually including buttons on the watch face. Calculator watches were first introduced in the 1970s and continue to be produced, despite falling from their peak popularity during the 1980s. The most dominant brands were the Casio Databank series and Timex.
The Hewlett-Packard HP-01 is a calculator watch. It was designed and manufactured by Hewlett-Packard (HP). The HP-01 used 7 light-emitting diodes (LEDs)/digit in a 7 digit + decimal point arrangement for its digital display. Introduced in 1977 at the height of the LED watch craze, five models were available, two gold filled models and three ...
A micrometer, sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw widely used for accurate measurement of components [1] in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers.
Tools. Tools. move to sidebar hide. Actions Read; Edit; View history; ... Micrometer can mean: Micrometer (device), used for accurate measurements by means of a ...
By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...
The comptometer-type calculator was the first machine to receive an all-electronic calculator engine in 1961 (the ANITA mark VII released by Sumlock comptometer of the UK). In 1890 W. T. Odhner got the rights to manufacture his calculator back from Königsberger & C , which had held them since it was first patented in 1878, but had not really ...
Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured.The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light.
The first scientific calculator that included all of the basic ideas above was the programmable Hewlett-Packard HP-9100A, [5] released in 1968, though the Wang LOCI-2 and the Mathatronics Mathatron [6] had some features later identified with scientific calculator designs.