# Relationship history for MSHA mine 1511822

Current hierarchy: **Mine Rescue Inc → M R I Mining Ltd → Mri Ltd Mine No 2**

- 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:** Vance Irene & Clarence F Wade → Mri Ltd Mine No 2; 1975-08-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** I & W Coal Company Inc → Mri Ltd Mine No 2; 1979-03-01 to 1980-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Vance Irene & Clarence F Wade → I & W Coal Company Inc; 1979-03-01 to 1980-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Mine Rescue Inc Et Al → Mri Ltd Mine No 2; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M R I Mining Ltd → Mri Ltd Mine No 2; 1980-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mine Rescue Inc Et Al → M R I Mining Ltd; 1980-07-22 to current/open; source msha-controller-operator-history