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1977-02-15
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1974-11-08
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1977-05-10
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1980-10-15
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1978-04-24
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1977-08-31
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1981-12-16
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1982-02-26
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1979-06-13
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1978-11-30
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1976-10-15
OPTICAL INFORMATION RECORDING DEVICE
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1976-12-20
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1980-11-28
RECORDING CARRIER WITH OPTICALLY LEGIBLE REFLECTIVE RADIATION INFORMATION STRUCTURE
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1978-04-14
OPTICAL READING HEAD
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1979-05-10
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1983-04-13
IMPROVEMENTS IN OPTICALLY LEGIBLE INFORMATION DISK
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1980-04-24
Optically reading record carrier pits
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1979-05-10
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1976-08-25
Record carrier on which information is stored in an optically readable structure
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1976-02-25
Record carrier on which information is recorded in an optical structure
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1977-02-27
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1976-08-25
Record carrier on which information is stored in an optically readable structure