# Relationship history for MSHA mine 2902331

Current hierarchy: **Gabriel  Martinez → GM Pipe, LLC → GM Pipe, LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** DTT Welding & Excavating Inc → GM Pipe, LLC; 2006-10-29 to 2022-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Dave L  Tainter → GM Pipe, LLC; 2006-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave L  Tainter → DTT Welding & Excavating Inc; 2006-10-29 to 2022-06-14; source msha-controller-operator-history
- **operator_operates_mine:** GM Pipe, LLC → GM Pipe, LLC; 2022-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gabriel  Martinez → GM Pipe, LLC; 2022-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gabriel  Martinez → GM Pipe, LLC; 2022-06-15 to current/open; source msha-controller-operator-history