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<p>[QUOTE=&quot;physics-fan3.14, post: 3257152, member: 19165&quot;]According to some, the standard has behaved like this over time: </p><p><br /></p><p><img src="http://www.montereyinstitute.org/courses/DevelopmentalMath/COURSE_TEXT2_RESOURCE/U18_L1_T1_text_final_6_files/image031.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>I like to think the standard has behaved more like this over time: </p><p><br /></p><p><img src="https://upload.wikimedia.org/wikipedia/commons/4/44/Simple_harmonic_motion.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>If you look at an MS-65 graded 30, 20, 10, and 1 year ago, sure, there may be some differences. But, they&#039;re probably all within a point of each other. Periods may have been a little looser (a 66 then may only be a 65 today), but just as many periods have been tighter (a 64 then would be a 65 today).[/QUOTE]</p><p><br /></p>

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