# Relationship history for MSHA mine 1510326

Current hierarchy: **Lewis Lonnie B & Estill Blair → T & V 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

- **controller_controls_mine:** Combs Herman Jr → No 1 Mine; 1975-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big H Combs Coal Company Inc → No 1 Mine; 1977-03-01 to 1978-05-24; source msha-controller-operator-history
- **controller_controls_operator:** Combs Herman Jr → Big H Combs Coal Company Inc; 1977-03-01 to 1978-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Hall Vernon → No 1 Mine; 1977-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & V Coal Company Inc → No 1 Mine; 1978-05-25 to 1979-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Hall Vernon → T & V Coal Company Inc; 1978-05-25 to 1979-06-19; source msha-controller-operator-history
- **operator_operates_mine:** T & V Coal Company Inc → No 1 Mine; 1979-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lewis Lonnie B & Estill Blair → No 1 Mine; 1979-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Lonnie B & Estill Blair → T & V Coal Company Inc; 1979-06-20 to current/open; source msha-controller-operator-history