It's probably GEHT 450 - a Gardenline brand sold by Aldi
Gardenline - Electric - Hedge - Trimmer - 450 Watts and made by Einhell.
You do not say why you took it apart and what reassembly problem you have so a helpful and sensible answer is difficult.
The flippant answer is to reassemble it in the reverse of how you dismantled it.
If you're having difficulty then your best - quickest and easiest option might be to ask a friendly old-codger to put it back together for you.
Good Luck...
An old codger..., May 2017
