# Relationship history for MSHA mine 4404701

Current hierarchy: **Deel Thomas G & Bill → Big Four Coal Corp → 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:** W & T Mining Company → No 1 Mine; 1977-05-01 to 1977-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Tucker Dennis E & Lawson Whitt → No 1 Mine; 1977-05-01 to 1977-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Tucker Dennis E & Lawson Whitt → W & T Mining Company; 1977-05-01 to 1977-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Anvil Coal Company → No 1 Mine; 1977-07-20 to 1978-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Tucker Dennis E & Jim Bunn → No 1 Mine; 1977-07-20 to 1978-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Tucker Dennis E & Jim Bunn → Anvil Coal Company; 1977-07-20 to 1978-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Clinteagle Mining Company Inc → No 1 Mine; 1978-01-05 to 1978-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Virgus → No 1 Mine; 1978-01-05 to 1978-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Virgus → Clinteagle Mining Company Inc; 1978-01-05 to 1978-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Big Four Coal Corp → No 1 Mine; 1978-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deel Thomas G & Bill → No 1 Mine; 1978-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deel Thomas G & Bill → Big Four Coal Corp; 1978-06-29 to current/open; source msha-controller-operator-history