Zero Google Page Rank for Component Vendors

There are a number of distinct sections for topics on the web site. One section just lists manufacturers or vendors in alphabetic order. Because it's a section consisting of about 100 pages, I track it.

Back in June of 2008 I posted a listing of all the pages with in the section that had a zero Google Page Rank: Page Rank and Listing of Manufacturers. Guess I'm checking again.... I really see no improvement in the component pages yet.
Page hits have fallen by 50% from Jan. 2007. But the Bounce rate as decreased by 50% as well [which is a good think]. Of course the 'A' components page gets the most hits, followed by the page that covers 'D' vendors, and so on.

Component Manufacturers with no Page Rank:
Equipment Manufacturers, Ae [A2].
Equipment Manufacturers, Amd [A4].
Equipment Manufacturers, Ap [Ap].
Equipment Manufacturers, Ar [A6].
Equipment Manufacturers, Asq [A7].
Equipment Manufacturers, Av [A8].
Equipment Manufacturers, Be [Be].
Equipment Manufacturers, Bi [B1].
Equipment Manufacturers, Bl [Bl].
Equipment Manufacturers, Br [B2].
Equipment Manufacturers, Cm [C3].
Equipment Manufacturers, Con [C4].
Equipment Manufacturers, Cp [C5].
Equipment Manufacturers, Dem [D1].
Equipment Manufacturers, E.
Equipment Manufacturers, Ec [Ec].
Equipment Manufacturers, El [E1].
Equipment Manufacturers, Em [E2].
Equipment Manufacturers, Ev [E4].
Equipment Manufacturers, Em [F1].
Equipment Manufacturers, Ga [G].
Equipment Manufacturers, Ge [Gen].
Equipment Manufacturers, Gi [G1].

I stop checking all but the main page for each letter. But I don't see any rank for any of these pages listed below.

Equipment Manufacturers, H.
Equipment Manufacturers, J.
Equipment Manufacturers, K.
Equipment Manufacturers, L.
Equipment Manufacturers, N.
Equipment Manufacturers, O.
Equipment Manufacturers, P.
Equipment Manufacturers, Q.
Equipment Manufacturers, R.
Equipment Manufacturers, S.
Equipment Manufacturers, U.
Equipment Manufacturers, V.
Equipment Manufacturers, X.
Equipment Manufacturers, Y.
Equipment Manufacturers, Z.

So many of these pages were just updated. So any bad links have been removed and replaced with just a text listing. I've also been adding text to indicate the date a company was acquired by another manufacturer. Why are these pages lacking any page ranking.

So this listing will provide yet another link to the pages that require a ranking. More external links mean a page rank? Maybe the number of links on each page are bleeding page rank, but what would be the point with out the links.

Any way, the updates over the last few months have not been picked up by any search engine yet.
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