Can't find the answers to three:
41 acr From the Latin for yoke. a pair of opposite leaves or the section of the forewing of some moths interlocking with the hindwings during flight J???H
50 acr Measurement in ohms of opposition to an alternating electric current
I?P?D?N?E
29dwn Mountain range in the Austrian Alps site of the resort of St Anton
A?L?E??
Thanks a lot