# Relationship history for MSHA mine 1516565

Current hierarchy: **Harold K  Simpson → Simpson Mining Company Inc → No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Solite Corp → No 3 Mine; 1974-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold K  Simpson → No 3 Mine; 1986-09-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Terry Glenn Coal Company Inc → No 3 Mine; 1989-02-01 to 1989-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Solite Corp → Terry Glenn Coal Company Inc; 1989-02-01 to 1989-05-02; source msha-controller-operator-history
- **operator_operates_mine:** P & M Coal Inc → No 3 Mine; 1989-05-03 to 1989-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Poteet Jerry & Randy Miller → No 3 Mine; 1989-05-03 to 1990-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Poteet Jerry & Randy Miller → P & M Coal Inc; 1989-05-03 to 1989-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Terry Glenn Coal Company Inc → No 3 Mine; 1989-09-12 to 1990-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Solite Corp → Terry Glenn Coal Company Inc; 1989-09-12 to 1990-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Marcum Zora → No 3 Mine; 1989-10-01 to 1991-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Big Z Coal Inc → No 3 Mine; 1990-06-25 to 1991-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Marcum Zora → Big Z Coal Inc; 1990-06-25 to 1991-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Mining Company Inc → No 3 Mine; 1991-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold K  Simpson → Simpson Mining Company Inc; 1991-09-04 to current/open; source msha-controller-operator-history