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2. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters. 1 ⁄ 2-, 4 ⁄ 5 - and 5 ⁄ 4-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs ...

3. Battery nomenclature - Wikipedia

   en.wikipedia.org/wiki/Battery_nomenclature

   A zinc-carbon lantern battery, consisting of 4 round "size 25" cells in series. Terminated with spring terminals. 4LR25-2: 4: L: R: 25: 2: An alkaline lantern battery, consisting of 2 parallel strings of 4 round "size 25" cells in series 6F22: 6: F: 22: A zinc-carbon rectangular battery, consisting of 6 flat "size 22" cells. Equivalent to a PP3 ...

4. Reference designator - Wikipedia

   en.wikipedia.org/wiki/Reference_designator

   IEEE 315-1975 / ANSI Standard Y32.2. Annex F: "Cross reference list of Class Designation Letters" compares IEC 113-2:1971 to the IEEE/ANSI standard. * AS 1102 and IEC 60617 for "Graphical Symbols for Electrotechnology".

5. Vacuum tube battery - Wikipedia

   en.wikipedia.org/wiki/Vacuum_tube_battery

   A rare form of "C" battery is the bias cell, a button-size miniature battery designed to deliver a constant voltage with no current drain. These were briefly popular between 1936 and 1945 as the bias cell was less costly than a resistor/capacitor bias network. [ 2 ]

6. These easy-to-use fire blankets are just $7 each ... - AOL

   www.aol.com/lifestyle/saved-my-home-these-easy...

   What reviewers say 💬. Over 4,000 shoppers say SecuCaptain fire blankets are a five-star purchase, and that they're breathing a little easier knowing they have them in their safety arsenal ...

7. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   41w – Battery-heated cup tube [8] (German: Press napf röhre) 50–59 – "Special construction types fitted with bases applicable to design features used"; [ 9 ] mostly locking bases: "9-pin Loctal" (B9G) or 8-pin Loctal (B8G); but also used for Octal and others (3-pin glass; Disk- seal incl. Lighthouse tubes; German 10-pin with spigot; min ...