# Relationship history for MSHA mine 3601478

Current hierarchy: **Caola Dennis F → J & D Mining Inc → Miller Run**

- 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:** John Ferko Jr Coal Co → Miller Run; 1950-01-01 to 1975-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Ferko John Jr Coal Company → Miller Run; 1950-01-01 to 1975-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Ferko John Jr Coal Company → John Ferko Jr Coal Co; 1950-01-01 to 1975-08-16; source msha-controller-operator-history
- **operator_operates_mine:** J & D Mining Inc → Miller Run; 1975-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Caola Dennis F → Miller Run; 1975-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caola Dennis F → J & D Mining Inc; 1975-08-17 to current/open; source msha-controller-operator-history