# Relationship history for MSHA mine 4403690

Current hierarchy: **Cline Linda & Linda Little → L & L Energy Company → 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:** P M & B Coal Company Inc → No 1 Mine; 1974-01-01 to 1978-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Preece-Mc Clanahan & Belcher Coal Company Inc → No 1 Mine; 1974-01-01 to 1980-09-17; source msha-controller-operator-history
- **controller_controls_operator:** Preece-Mc Clanahan & Belcher Coal Company Inc → P M & B Coal Company Inc; 1974-01-01 to 1978-03-20; source msha-controller-operator-history
- **operator_operates_mine:** H J & H Coal Company Inc → No 1 Mine; 1978-03-21 to 1980-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Justus Donald Et Al → No 1 Mine; 1978-03-21 to 1980-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Justus Donald Et Al → H J & H Coal Company Inc; 1978-03-21 to 1980-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Corbin Eugene  Cline et al → No 1 Mine; 1978-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Coal Company → No 1 Mine; 1980-04-03 to 1981-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Corbin Eugene  Cline et al → Triangle Coal Company; 1980-04-03 to 1981-12-29; source msha-controller-operator-history
- **operator_operates_mine:** L & L Energy Company → No 1 Mine; 1981-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cline Linda & Linda Little → No 1 Mine; 1981-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cline Linda & Linda Little → L & L Energy Company; 1981-12-30 to current/open; source msha-controller-operator-history