# Relationship history for MSHA mine 4607396

Current hierarchy: **Hayhurst James W Ii → Armstrong Mining Inc → Lowlands #4**

- 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

- **controller_controls_mine:** Metec Acquisition Corp → Lowlands #4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lowlands Coal Corp → Lowlands #4; 1987-11-01 to 1988-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Metec Acquisition Corp → Lowlands Coal Corp; 1987-11-01 to 1988-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Lowlands Coal Corp → Lowlands #4; 1988-09-28 to 1989-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Rsv → Lowlands #4; 1988-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rsv → Lowlands Coal Corp; 1988-09-28 to 1989-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Armstrong Mining Inc → Lowlands #4; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hayhurst James W Ii → Lowlands #4; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hayhurst James W Ii → Armstrong Mining Inc; 1989-09-01 to current/open; source msha-controller-operator-history