Thu, May 23, 2013 12:00 - Petrotech Oil & Gas, Inc. (PTOG: OTC Link) - Tier Change - The symbol, PTOG, no longer is classified as OTC Pink Limited. As of Thu, May 23, 2013, PTOG resides in the OTC Pink Current tier. You may find a complete list of tier changes at otcmarkets.com.
Petrotech Oil and Gas (CE) (USOTC:PTOG)
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