Question

نویسندگان بر خود لازم می دانند از تمامی دست اندرکاران این مجموعه و همچنین از تمامی مسئولین و کارکنان دو ریخته گری که صمیمانه همکاری نمودند، سپاسگزاری نمایند.

Answer 1

The writers feel obliged to thank all the personnel/staff of this complex and also all the officials/executives and workers/employees of the two foundries for extending their sincere cooperation. 

Answer 2

The authors/writers take it upon themselves to thank/express their gratitude and appreciation on all those involved in this project/group/community...