Google supplemental index

Google has a couple of different indexes, its main index and the supplemental index. Google considers pages in the supplemental index as less important to normal pages. Or its nearly impossible for pages in this index to be returned during a search unless very few other pages match the search criteria. interfacebus has 136 pages in the supplemental index, out of another 1,230 pages in the normal index.

Many of the pages in the supplemental index are orphaned pages [old pages no longer used], and 'Bad Address' pages [pages that redirect misspelled addresses]. However many pages are also normal pages with no real issue and really should not be listed there. Here are a few of the pages:
Military D-Sub Connector Manufacturers
Stepper Motor Manufacturers
Linear Actuator Manufacturers
Circuit Breaker Manufacturers
Real Time Clock Manufacturers
CompactFlash Card Pinout


This is just a few of the pages, most don't have a page rank. One reason for ending up in the supplemental index ~ the page looks like another page. This is common to have near redundant content; for example when the Linear Actuator page was started using the Motor page as a starting point.

It appears it's getting a bit harder to determine which pages are listed in the supplemental index, this is the command I used to determine the page listing;
site:www.interfacebus.com/&