First, we don't have everything in the program just yet and we do appreciate your patience with us. We program this in our spare time.
Now, where is that piece of equipment? Well, if you don't have the later books a good place to start is to set SSW to Experimental Tech -> All Eras (non-canon). You can then check the availability of an item by era or even year, which makes that a great setting for lookups. If you do have the books, check the item itself and find out when it was available.