{TAIL ~ The above mentioned constitution} and {HEAD ~ basic operations} of the ADF 2 have been disclosed in the specification of Japanese Patent Application No 276388/1991 filed by the present applicant on Sep. 30, 1991 
{ TAIL ~ The above mentioned constitution } and { HEAD ~ basic operations } of the ADF 2 have been disclosed in the specification of Japanese Patent Application No 276388/1991 filed by the present applicant on Sep. 30 , 1991
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