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1
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2
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3
Date [1951]
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4
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5
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6
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7Subjects: “…scheikundige industrie…”
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8
Date 1957
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9
Date 1982
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10
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11
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12
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13Subjects: “…auto-industrie…”
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14
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15
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16
Date 1966
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17
Date 1983
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18Subjects: “…auto-industrie…”
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19
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20