# Relationship history for MSHA mine 3401568

Current hierarchy: **Kenneth  Richardson → P & K Company Ltd → Pollyanna #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kenneth  Richardson et al → Pollyanna #5; 1975-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Acorn Systems Inc → Pollyanna #5; 1986-03-01 to 1986-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Baily Russell E → Pollyanna #5; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baily Russell E → Acorn Systems Inc; 1986-03-01 to 1986-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Black Star Coal Inc → Pollyanna #5; 1986-10-01 to 1987-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Roller Ron → Pollyanna #5; 1986-10-01 to 1987-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Roller Ron → Black Star Coal Inc; 1986-10-01 to 1987-03-11; source msha-controller-operator-history
- **operator_operates_mine:** P & K Company Ltd → Pollyanna #5; 1987-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Richardson et al → P & K Company Ltd; 1987-03-12 to current/open; source msha-controller-operator-history