# Relationship history for MSHA mine 1516073

Current hierarchy: **Mc Farland Joseph → Jacob Coal Company Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Broken Heart Coal Corp → No 2; 1987-06-01 to 1989-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Mapes Billy → No 2; 1987-06-01 to 1989-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Mapes Billy → Broken Heart Coal Corp; 1987-06-01 to 1989-01-24; source msha-controller-operator-history
- **operator_operates_mine:** New Generation Inc → No 2; 1989-01-25 to 1989-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Dalton Marion Jr → No 2; 1989-01-25 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Dalton Marion Jr → New Generation Inc; 1989-01-25 to 1989-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Todco Inc → No 2; 1989-08-23 to 1990-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Marcum Thomas Wayne → No 2; 1989-08-23 to 1990-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Marcum Thomas Wayne → Todco Inc; 1989-08-23 to 1990-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Mc Farland Joseph → No 2; 1989-09-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Twin Coal Company Inc → No 2; 1990-02-16 to 1990-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Farley James E → No 2; 1990-02-16 to 1990-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Farley James E → Twin Coal Company Inc; 1990-02-16 to 1990-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Jacob Coal Company Inc → No 2; 1990-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Farland Joseph → Jacob Coal Company Inc; 1990-05-11 to current/open; source msha-controller-operator-history