Production photos from the duplicate MST-13 circuit PC-board from the green Thüring PC-boards; the design is the same as the prototype MST-13 PC-board, but colour green and industrial fabricated; Notabene: With attributs PT-35B; PT-35(b); DP-31(b) starting from 12th of May 1990 on. IMAGE, prod. U/7946 see legende c;---q;---r; Thüring MST-13 circuit PC-board; mark: c.....without the letter "M"; mark: q.....perfect soldering lines; mark: r.....defect solderpoint; mark: f.....the curve was not removed. IMAGE 2: This picture shows a green Thüring MST-13 printed circuit PC-board. The curve "f" on the corner not yet being milled out indicates clearly that the PC-board does also not originate from a MST-13 timer ready for operation. A specific damage of material probably caused by an explosion on the solderpoint "r" indicates clearly that from this empty circuit board the green MST-13 fragment was fabricated. The form of the damaged "r" on the empty PC-board of the Thüring board is congruent with the form of the damaged "r" of the MST-13 fragment on IMAGE 3. IMAGE, prod. U/7948: the manipulated green duplicate MST-13 timer fragment PT-35B, without the letter "M".