# Relationship history for MSHA mine 3300990

Current hierarchy: **Barr Edward F → Monroe Coal Company Inc → Low Ash No 2 Mine**

- 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:** Monroe Coal Company → Low Ash No 2 Mine; 1950-01-01 to 1974-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Mc Pherson Eugene C → Low Ash No 2 Mine; 1950-01-01 to 1974-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Mc Pherson Eugene C → Monroe Coal Company; 1950-01-01 to 1974-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Monroe Coal Company Inc → Low Ash No 2 Mine; 1974-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barr Edward F → Low Ash No 2 Mine; 1974-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barr Edward F → Monroe Coal Company Inc; 1974-12-15 to current/open; source msha-controller-operator-history