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SC 13D

Beneficial Ownership Report

GEOSPACE TECHNOLOGIES CORP Filed 1997-12-15 Acc 0000950134-97-009335

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SC 13D Beneficial Ownership Report ,

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2018-04-03 SC 13D Beneficial Ownership Report
1997-12-15 SC 13D Beneficial Ownership Report
1997-12-10 4 Changes in Ownership
1997-12-10 4 Changes in Ownership
1997-12-10 4 Changes in Ownership
1997-12-10 4 Changes in Ownership
1997-12-10 4 Changes in Ownership

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