# Relationship history for MSHA mine 1517399

Current hierarchy: **Harold K  Simpson → Simpson Mining Company Inc → Mine #5**

- 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 #5; 1986-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James A  Hubbard → Mine #5; 1991-08-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hubb Corp → Mine #5; 1993-04-01 to 1995-04-13; source msha-controller-operator-history
- **controller_controls_operator:** James A  Hubbard → Hubb Corp; 1993-04-01 to 1995-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Mining Company Inc → Mine #5; 1995-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold K  Simpson → Simpson Mining Company Inc; 1995-04-14 to current/open; source msha-controller-operator-history