The ERIKS group has agreed to buy Wielens Beheer B.V. in Groningen, the Netherlands.   ; Wielens sells electromechanical power transmission equipment parts and services. Wielens serves mainly the industrial maintenance market (MRO) and has annual sales of & euro; 22 million.   ; ERIKS says that the acquisition fits in its strategy of aiming at the top three" position in each core activity in all countries in which ERIKS is present to grow local presence.   ; With the acquisition, ERIKS gains nine branches including a central warehouse.