# Relationship history for MSHA mine 1510556

Current hierarchy: **Cardinal Resources Inc → Cardinal Resources Inc → No 18**

- 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

- **controller_controls_mine:** Becknell Nancy → No 18; 1976-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kenergy Industries Inc → No 18; 1977-07-01 to 1978-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Becknell Nancy → Kenergy Industries Inc; 1977-07-01 to 1978-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Vineard Virginia Lee → No 18; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cardinal Resources Inc → No 18; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valcour Mining Inc → No 18; 1978-07-26 to 1979-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Vineard Virginia Lee → Valcour Mining Inc; 1978-07-26 to 1979-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Reita Mining Inc → No 18; 1979-04-19 to 1980-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Asher W Forrest Et Al → No 18; 1979-04-19 to 1980-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Asher W Forrest Et Al → Reita Mining Inc; 1979-04-19 to 1980-07-17; source msha-controller-operator-history
- **operator_operates_mine:** Cardinal Resources Inc → No 18; 1980-07-18 to 1984-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Resources Inc → Cardinal Resources Inc; 1980-07-18 to 1984-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Ball Ralph → No 18; 1981-06-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sterling Energy Inc → No 18; 1984-02-14 to 1984-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Ball Ralph → Sterling Energy Inc; 1984-02-14 to 1984-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Cardinal Resources Inc → No 18; 1984-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Resources Inc → Cardinal Resources Inc; 1984-08-21 to current/open; source msha-controller-operator-history