# Relationship history for MSHA mine 1511022

Current hierarchy: **Tanner Walter-Joe Hawk & Henry Griesdiech → Extra Energy Coal Company → Mc Roberts Site D**

- 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:** Extra Energy Coal Company → Mc Roberts Site D; 1977-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tanner Walter-Joe Hawk & Henry Griesdiech → Mc Roberts Site D; 1977-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tanner Walter-Joe Hawk & Henry Griesdiech → Extra Energy Coal Company; 1977-12-01 to current/open; source msha-controller-operator-history