Lemelson Capital Management Filings

SC 13D/A

GEOSPACE TECHNOLOGIES CORP

15 Jul 20

SC 13D/A

GEOSPACE TECHNOLOGIES CORP

12 Dec 18

SC 13D/A

GEOSPACE TECHNOLOGIES CORP

15 May 18

SC 13D

GEOSPACE TECHNOLOGIES CORP

3 Apr 18

SC 13G/A

GEOSPACE TECHNOLOGIES CORP

15 Feb 18

SC 13G/A

GEOSPACE TECHNOLOGIES CORP

11 Jan 17

SC 13G/A

GEOSPACE TECHNOLOGIES CORP

25 Jan 16

SC 13G

GEOSPACE TECHNOLOGIES CORP

30 Nov 15