# Relationship history for MSHA mine 4605198

Current hierarchy: **Baker Daris → D & J Coal Company → 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:** D & J Coal Company → No 2 Mine; 1976-06-01 to 1977-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Harrison Tommy → No 2 Mine; 1976-06-01 to 1977-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Harrison Tommy → D & J Coal Company; 1976-06-01 to 1977-10-06; source msha-controller-operator-history
- **operator_operates_mine:** D & J Coal Company → No 2 Mine; 1977-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Baker Daris → No 2 Mine; 1977-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baker Daris → D & J Coal Company; 1977-10-07 to current/open; source msha-controller-operator-history