# Relationship history for MSHA mine 3401633

Current hierarchy: **Kenneth  Richardson → Heatherly Mining Inc → Pollyanna #4**

- 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:** Heatherly Mining Inc → Pollyanna #4; 1988-01-01 to 1989-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Richardson et al → Pollyanna #4; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Richardson et al → Heatherly Mining Inc; 1988-01-01 to 1989-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Ok & Wv → Pollyanna #4; 1989-08-15 to 1991-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Robinson A F & Robert D Bell → Pollyanna #4; 1989-08-15 to 1991-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Robinson A F & Robert D Bell → Ok & Wv; 1989-08-15 to 1991-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Acm Oklahoma Inc → Pollyanna #4; 1991-01-24 to 1992-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Advanced Contract Mining Inc → Pollyanna #4; 1991-01-24 to 1992-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Advanced Contract Mining Inc → Acm Oklahoma Inc; 1991-01-24 to 1992-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Heatherly Mining Inc → Pollyanna #4; 1992-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Richardson et al → Heatherly Mining Inc; 1992-01-22 to current/open; source msha-controller-operator-history