# Relationship history for MSHA mine 1511382

Current hierarchy: **Mc Henry H Thomas → Mineral Processing Inc → No 1 Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Tanner Walter-Joe Hawk & Henry Griesdiech → No 1 Plant; 1977-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Extra Energy Coal Company → No 1 Plant; 1978-04-01 to 1980-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Tanner Walter-Joe Hawk & Henry Griesdiech → Extra Energy Coal Company; 1978-04-01 to 1980-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Echo Industries Inc → No 1 Plant; 1980-03-12 to 1981-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Eickenhorst Frank C → No 1 Plant; 1980-03-12 to 1981-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Eickenhorst Frank C → Echo Industries Inc; 1980-03-12 to 1981-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Processing Inc → No 1 Plant; 1981-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Henry H Thomas → No 1 Plant; 1981-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Henry H Thomas → Mineral Processing Inc; 1981-10-22 to current/open; source msha-controller-operator-history