# Relationship history for MSHA mine 1516509

Current hierarchy: **Harold K  Simpson → Simpson Mining Company Inc → #2**

- 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:** Robbins Gus D → #2; 1984-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold K  Simpson → #2; 1986-09-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Wallins Coal Company Inc → #2; 1988-10-01 to 1989-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Robbins Gus D → Harlan Wallins Coal Company Inc; 1988-10-01 to 1989-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Lee Mining Inc → #2; 1989-03-09 to 1989-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Goodman Eddie → #2; 1989-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Goodman Eddie → Lee Mining Inc; 1989-03-09 to 1989-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Little Brooke Mining Inc → #2; 1989-08-07 to 1989-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Haynes Don → #2; 1989-08-07 to 1989-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Haynes Don → Little Brooke Mining Inc; 1989-08-07 to 1989-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Mining Company Inc → #2; 1989-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold K  Simpson → Simpson Mining Company Inc; 1989-11-09 to current/open; source msha-controller-operator-history