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0001437749-18-004982.txt | 2018-03-19 17:24:30 | |
logo1.jpg | 12111 | 2018-03-19 17:24:30 |
sigm20180316_defm14a.htm | 3928228 | 2018-03-19 17:24:30 |
sigma_logo.jpg | 2520 | 2018-03-19 17:24:30 |