exhibit 10. 11 sales contract today, december tenth, two thousand nineteen december 10, 2019 the following persons simultaneously appeared before me, notary bernhard h i l l e, with a registered office in augsburg in the business office located at annastrasse 4, 86150 augsburg : 1st mr. eric bader, born on 9 / 9 / 1977, residing in monchsdeggingen, identified by an official photo id, 1st 1st mr. eric bader, born on 9 / 9 / 1977, residing in monchsdeggingen, identified by an official photo id, with a business address at daimlerstrasse 22, 86368 gersthofen ; here acting not in his own name, but a ) as authorized representative and managing director who is exempt from the limitations of § 181 bgb ( burgerliches gesetzbuch [ german civil code ] ) for a ) a ) as authorized representative and managing director who is exempt from the limitations of § 181 bgb ( burgerliches gesetzbuch [ german civil code ] ) for exone property gmbh, with its registered office in gersthofen ( business address : daimlerstrasse 22 in 86368 gersthofen ), entered in the commercial register of the augsburg district court under hrb 28119 - hereinafter referred to as “ seller 1 ” - and b ) as authorized representative and managing director who is exempt from the limitations of § 181 bgb for b ) b ) as authorized representative and managing director who is exempt from the limitations of § 181 bgb for exone gmbh, with its registered office in gersthofen ( business address : daimlerstrasse 22 in 86368 gersthofen ), entered in the commercial register of the augsburg district court under hrb 20036 508uc - 2 - - hereinafter referred to as “ seller 2 ” - 2. mr. anton kopp, born on 11 / 30 / 1948, 2. 2. mr. anton kopp, born on 11 / 30 / 1948, personally known to me, with a business address at ludwigstrasse 13 in 86152 augsburg, here a c t i n g not in his own name, but as an authorized managing director of the solidas immobilien und grundbesitz gmbh with its registered office in augsburg ( business address : ludwigstrasse 13, 86152 augsburg ), entered in the commercial