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Property and equipment, net
 3 Months Ended
Mar. 31, 2021
Property and equipment, net [Abstract]  
Property and equipment, net
7.
Property and equipment, net:

During the three-month period ended March 31, 2021, $77,112 additions to property and equipment concern machinery, office and other equipment and the remaining additions to the account relate to property and equipment acquired from UltraCell (Note 3). There are no collaterals or other commitments on the Company’s property and equipment.