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Hand tool for notching cards. To record data, the paper stock between a hole and the nearest edge was removed by a special notching tool. The holes were assigned a meaning dependent upon a particular application. For example, one hole might record the answer to a yes/no question on a survey, with the presence of a notch meaning "yes".
A pattern notcher is a common tool used in patternmaking and sewing that creates a notch in a paper pattern. [1] Notches are used to align pattern pieces. Notches in the paper are more useful than marks on the paper as they allow the mark to be seen whether pattern paper is face up or face down.
Thus, some programs have begun to monitor injuries through publicly available reports such as news media. [20] The logging industry experiences the highest fatality rate of 23.2 per 100,000 full-time equivalent (FTE) workers and a non-fatal incident rate of 8.5 per 100 FTE workers.
End notching works the end of the tube, such as a semicircular concavity to make the base of a tee, or a convex vee to fit into a mitre. Vee-notched tube, bent for assembly of a mitred joint. Side notching (also called offset notching) works the side of a tube with a vee notch for bending, semicircular or vee notches for tee joint.
The type of notch introduced to a specimen depends on the material and characterization employed. For standardized testing of fracture toughness by the Charpy impact method, specimen and notch dimensions are most often taken from American standard ASTM E23, or British standard BS EN ISO 148-1:2009.
Often vacuum-tube computers made extensive use of solid-state ("crystal") diodes to perform AND and OR logic functions, and only used vacuum tubes to amplify signals between stages or to construct elements such as flip-flops, counters, and registers. The solid-state diodes reduced the size and power consumption of the overall machine.
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