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Meter Standard M-a1a
A replica of the platinum-iridium bar in Paris that was the international standard for length before 1960. Fishbane Chapter:   1.3 HRW 9th:   1.05 Reese Chapter:   1.3 RHK 5th:   1.4 SJ 3rd Chapter:   1.1 PIRA DCS classification:   1A10.35

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University