PA registration questions

[fsstnotch]

Ok.. I was bored so I decided to start looking into the registration process I will have the pleasure to undergo...

I've heard people say that wipers and defroster are mandatory items. Reading PA Code 175.220 says absolutely nothing about defroster. this is what i read on the 2 subjects...

"(2) Check the windshield and reject if one or more of the following apply:

(i) A windshield is less than 7 inches in vertical height on a street rod.

(ii) A windshield is less than 12 inches in vertical height, or the vertical height is less than what was originally designed, on a reconstructed or specially constructed vehicle.

(iii) The windshields and side windows or openings do not allow the driver minimum outward horizontal vision capability of 90° from each side of vertical plane passing through fore and aft centerline of vehicle.

(iv) The range of vision is interrupted by window framing exceeding 2 inches in width and windshield door post support areas exceeding 4 inches in width.

(v) Obstructions except windshield wiper components of more than 2 inches upward into horizontally projected vision area of the windshield is found."

It just says there can be obstructions over 2" EXCEPT wipers... doesn't say they need to be there.

Then

(b) Internal inspection. An internal inspection shall be performed as follows:

(1) Check the mirrors and reject if the mirrors for the operator are insufficient to view front and both sides and rear of vehicle for distance not less than 200 feet.

(2) Check the unconventional operation location and reject if all the major controls and switches are not conveniently located for use by the driver while in an unconventional operating position.

Nothing about defroster at all. Is this just extremely vague? Is there a better guidance?

Thanks
Josh