| http://www.w3.org/ns/prov#value | - Opto-magnetic writing and reading apparatus in accordance with claim 1, wherein said control means is a microprocessor which storesa first time period which is from the start of revolution of said revolving means to putting-down of said raise/put-down means and a second time period which is from the start of revolution of said revolving means to a time to switch said revolution speed from said hig
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