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Then, the bottom of the gauge block is observed (through the optical flat) for oil or color. For Federal Grades 0.5, 1, and 2 and ISO grades K, 00, and 0 no oil or color should be visible under the gauge block. For Federal Grade 3 and ISO grades 1 and 2, no more than 20% of the surface area should show oil or color.
HP-19C calculator HP-29C with AC-powered battery charger. The HP-19C and HP-29C were scientific/engineering pocket calculators made by Hewlett-Packard between 1977 and 1979. They were the most advanced and last models of the "20" family (compare HP-25) and included Continuous Memory (battery-backed CMOS memory) as a standard feature.
It uses AG10 batteries and has 3 key independent memory and has a hard shell cover. It costs $62.99 on the official Victor website for a 10 pack so 62.99/10 would be $6.299 for 1 calculator. [5] 907 - The 907 is a black and grey/gray 1.6 oz portable calculator with a 10-digit LCD display with 20 built-in conversion functions. It includes a ...
[1] [2] He was granted his first Swedish patent on 2 May 1901, Swedish patent No. 17017 called "Gauge Block Sets for Precision Measurement". He formed the Swedish company CE Johansson AB (CEJ AB), Eskilstuna, Sweden in 1911. The first CEJ gauge block set in America was sold to Henry M. Leland at Cadillac Automobile Co. around 1908.
Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard. It is used as a reference for the setting of measuring equipment used in machine shops , such as micrometers , sine bars , calipers , and dial indicators (when used in an inspection role ).
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Brunsviga 15 Mechanical Calculator Original Odhner-Arithmos-Typ-5. Brunsviga is a calculating machine company whose history goes back to 1892 with devices upgrading from mechanical to electrical thereafter. The firm Grimme & Natalis that manufactured the machines changed their name to Brunsviga Maschinenwerke A.G. in 1927.