9 across (9) D?N?M?T?R Electrical machine with two armature windings. 24 across (5) A?T?L Russian workers` guild. 25 across (9) Popular name for french chalk S???S?O?E. 15 down (8) ?Y?O???P. Hard woody fruit such as the coconut.
Thanks also to scorpiojo. All gaps filled now. Today`s puzzle seemed to contain more really obscure solutions than usual - I had to search for most of the answers. Anno domini, I suppose.