[anton_tarasenko]

Two reasons:

1. Agencies often buy from distributors and integrators, not publishers. In this case, original manufacturers may appear in the variable `descriptionofcontractrequirement`.

2. Spelling may differ. Variable `dunsnumber` is be a better indicator for uniqueness.

[us0r]

And DUNS number is also pretty useless as it is based on location (not organization).

A search on sam.gov for "lockheed" results in 207 records (all probably the same company).