# Relationship history for MSHA mine 1507065

Current hierarchy: **Varney Barry & Ronnie Thacker → Kellie Mellisa Coal Company Inc → No 1 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:** Leedy Varney & Thacker Coal Company → No 1 Mine; 1974-01-01 to 1975-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Leedy-Varney & Thacker Coal Company → No 1 Mine; 1974-01-01 to 1975-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Leedy-Varney & Thacker Coal Company → Leedy Varney & Thacker Coal Company; 1974-01-01 to 1975-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Thacker Coal Company → No 1 Mine; 1975-05-01 to 1976-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Varney Barry & K P Leedy → No 1 Mine; 1975-05-01 to 1976-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Varney Barry & K P Leedy → Thacker Coal Company; 1975-05-01 to 1976-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Kellie Mellisa Coal Company Inc → No 1 Mine; 1976-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Varney Barry & Ronnie Thacker → No 1 Mine; 1976-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Varney Barry & Ronnie Thacker → Kellie Mellisa Coal Company Inc; 1976-06-18 to current/open; source msha-controller-operator-history