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20 February 2011
- 20:5020:50, 20 February 2011 diff hist +6 Transport in Antarctica →Land transport
- 20:4920:49, 20 February 2011 diff hist −3 Transport in Antarctica →Land transport
- 20:4820:48, 20 February 2011 diff hist −15 Transport in Antarctica →Land transport: The trans-antarctic expedition that was planned for 2009 has now taken place, in Nov/Dec 2010
- 20:2120:21, 20 February 2011 diff hist 0 West Africa Squadron typo
- 19:0719:07, 20 February 2011 diff hist 0 Analog temperature controlled crystal oscillator typo, missing period
- 17:4817:48, 20 February 2011 diff hist +223 Crystal oscillator →Commonly used crystal frequencies: Added common PAL quartzes, better precision of values
- 16:4916:49, 20 February 2011 diff hist +1 Elinvar According to balance wheel, invented in 1896.
- 16:3616:36, 20 February 2011 diff hist +129 Quartz clock →Explanation: Not only does electricity cause oscillation, but also the other way around.
- 16:3216:32, 20 February 2011 diff hist +4 Quartz clock →Mechanism: Link cantilever
- 16:2716:27, 20 February 2011 diff hist +422 Talk:Quartz →Missing closing parenthesis: new section