# Relationship history for MSHA mine 1518419

Current hierarchy: **Harold K  Simpson → Motivation Enterprise Inc. → Mine # 1**

- 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:** Harold K  Simpson → Mine # 1; 1986-09-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Mining Company Inc → Mine # 1; 2001-08-01 to 2004-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Harold K  Simpson → Simpson Mining Company Inc; 2001-08-01 to 2004-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Simpco Enterprises Corporation → Mine # 1; 2004-02-13 to 2004-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Harold K  Simpson → Mine # 1; 2004-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold K  Simpson → Simpco Enterprises Corporation; 2004-02-13 to 2004-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Mining Company Inc. → Mine # 1; 2004-02-18 to 2004-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Harold K  Simpson → Simpson Mining Company Inc.; 2004-02-18 to 2004-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland Gap Contracting Inc. → Mine # 1; 2004-02-23 to 2004-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Johnson → Mine # 1; 2004-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Johnson → Cumberland Gap Contracting Inc.; 2004-02-23 to 2004-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Motivation Enterprise Inc. → Mine # 1; 2004-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold K  Simpson → Mine # 1; 2004-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold K  Simpson → Motivation Enterprise Inc.; 2004-06-07 to current/open; source msha-controller-operator-history