# Relationship history for MSHA mine 1508683

Current hierarchy: **Smith Jim R → Jiward Coal Company Inc → Jade Strip**

- 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:** Cord Coal Company Inc → Jade Strip; 1975-07-08 to 1976-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Duncan Ralph E Et Al → Jade Strip; 1975-07-08 to 1976-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Duncan Ralph E Et Al → Cord Coal Company Inc; 1975-07-08 to 1976-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Cord Coal Company Inc → Jade Strip; 1976-02-01 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Oates Charles K → Jade Strip; 1976-02-01 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Oates Charles K → Cord Coal Company Inc; 1976-02-01 to 1978-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Jade Coal Company Inc → Jade Strip; 1978-03-01 to 1978-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Wardlaw John & Dickie Small → Jade Strip; 1978-03-01 to 1978-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Wardlaw John & Dickie Small → Jade Coal Company Inc; 1978-03-01 to 1978-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Jiward Coal Company Inc → Jade Strip; 1978-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Jim R → Jade Strip; 1978-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Jim R → Jiward Coal Company Inc; 1978-09-15 to current/open; source msha-controller-operator-history