# Relationship history for MSHA mine 1502740

Current hierarchy: **Leedy K P → Threesome Coal Company → No 10 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 R T Coal Company Inc → No 10 Mine; 1950-01-01 to 1973-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Dunavant Enterprises Inc → No 10 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dunavant Enterprises Inc → D R T Coal Company Inc; 1950-01-01 to 1973-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Jann Coal Company → No 10 Mine; 1973-06-02 to 1975-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Jann Coal Company → No 10 Mine; 1973-06-02 to 1975-11-11; source msha-controller-operator-history
- **controller_controls_operator:** Jann Coal Company → Jann Coal Company; 1973-06-02 to 1975-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Leedy K P → No 10 Mine; 1975-06-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** V & H Coal Company → No 10 Mine; 1975-11-12 to 1976-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Varney Barry & Dewey Honaker → No 10 Mine; 1975-11-12 to 1976-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Varney Barry & Dewey Honaker → V & H Coal Company; 1975-11-12 to 1976-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Threesome Coal Company → No 10 Mine; 1976-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leedy K P → Threesome Coal Company; 1976-08-09 to current/open; source msha-controller-operator-history