txoilgas:These would be only those that are related to commercial operations. Several groups such as Bells have different types of categories.
Not to rain on your parade, but I have to agree with BruceS on this one. I've waymarked several of these in the Windmills category, and see no compelling reason to pull out a subset of an existing category to form a new, smaller, more restrictive category.
There are now two categories for bells, but they are mutually exclusive. The new Belltowers cat would not have any, or very few, waymarks that could be included in the other Bells category.
No one is suggesting that there should not be overlap among categories, but this is a case of total redundancy, as I see it.