What key details about serge muhmenthaler can be extracted from the following bio? Bio: serge muhmenthaler -lrb- born 20 may 1953 in grenchen -rrb- is a retired swiss football player and referee . he played as a midfielder and defender during the 1970s and 1980s . as referee he is known for having refereed a swiss cup final , a uefa cup final and one match in the 1996 uefa european football championship .
- clubs is fc grenchen bsc young boys fc basel- position is midfielder and striker- years is until 1972 1972 -- 1975 1975 -- 1978- youthclubs is fc grenchen- youthyears is until 1972- birth date is 20 may 1953- name is serge muhmenthaler- birth place is grenchen , switzerland