作者：Sigma Labs(SGLB)
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$Sigma Labs(SGLB)$ 8-K - Current report Filed: 2019-05-08 AccNo: 0001493152-19-006587 Size: 551 KBItem 1.01: Entry into a Material Definitive AgreementItem 3.02: Unregistered Sales of Equity SecuritiesItem 9.01: Financial Statements and Exhibits 网页链接