A multi-server retrial queue with a finite number of sources of requests was considered. In contrast to similar models studied in the literature. we assumed this number is not constant but changes its value in a finite range. During the stay in the system. https://www.bekindtopets.com/mega-pick-Silbrade-Braid-Reinforced-Silicone-Tubing-1-4-ID-x-520-OD-x-1-hot-grab/