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Comments to #18 All comments (2)
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Eliphalet 6 month s ago
#44 Caesium atomic clocks have been used as a reference standard since the 1950s. This one is unusually big though, look for "HP 5060A" for a more normal sized one (released in the 1960s).
       
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Margo 2 days ago
#4 Why did the Alps need to fly home?
       
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