Is there a way to know if Lego has officially stopped making a certain Lego element?
As an example, from the 580 Lego set, I haven't seen this conveyor belt (along with those wheels and the "Legoland" stamped brick, etc) since the 1970's, so I assume it's out of production:

But is there any official word from Lego that certain elements are no longer in production?


Lego do have an internal 'bible' of parts that designers can use, but they haven't published this.
– Frankie Roberto Dec 20 '12 at 15:17