Reorganized in 1984 as a privately held company, Fiserv transformed itself through a corporate acquisitions strategy resulting in more than 150 acquisitions during the following 25 years. Beginning as a $21 million business with 350 employees, by 2009 it had become a Fortune 500 company worth $4.7 billion with more than 19,000 employees.
GnuPG Signature/Key. GPG file is a GnuPG Signature/Key file. GnuPG, which stands for GNU Privacy Guard (GPG) is the GNU project's complete and free implementation of the OpenPGP standard as defined by RFC4880 .
Moist clays, shale, and other high conductivity materials, may attenuate or absorb GPR signals, greatly decreasing the depth of penetration to 3 feet (1 meter) or less. The depth of penetration is also determined by the GPR antenna used. Antennas with low frequencies of from 100 to 200 MHz obtain subsurface reflections from deeper depths (about 25 to 100 feet or more), but have low resolution.