From what I've seen so far, the companies that you claim indicate "bad data" are all foreign companies that import people into this country. And so far, all of the legitimate US companies show no dupes.
Example:
ABCOM CONSULTING AND TRNG
That company is based in India apparently. Take a look at their webpages..
MUMBAI - RETAIL NETWORK - SERVICES DETAILS AT- BOMBAY / MUMBAI-- INDIA
Funny how they look for "programmer analysts", as in THIS directory they claim to be involved with advertising and gifts..
From Search via Alphabetical Listings:
100. Abcom Consulting Co Mumbai, India (91022)567-5770 Advertising / Promotion / Gifts
Now THAT company deserves a serious looking into I'd think.
Next, as an example we have the 3 Com corportation. Sure, they hire H1-B workers but they have different start dates as you correctly notice.
If you find any "duplicate" records for any US corporation, let us know...
Gimme a break. You're data is HOSED. MOTIVE provide MOTIVE. Why would a company OVER permit for H1Bs? Why would the do so blatantly in an easily detected way? WHY?
Just for grins, and because election results are coming in slow, I took your "challenge", and I must say that apparently you only searched for info on one company. If you'll recall I'm the one that showed DCM was a foreign owned company. You popped out ABCOM from my big list and then declared that from "what you've seen so far" all the bad data companies are foreign. Well here's the results from the next three companies on that big list:
ANGELICA'S RECORD DISTRIBUTOR -
http://2cds.com/show.php3?Which=795
APAR INFOTECH CORPORATION -
http://www.apar.com/
ARCSIGHT INC -
http://www.arcsight.com/about.htm
All American, all with suspicious duplicates. YOU LOSE!