# Relationship history for MSHA mine 4606702

Current hierarchy: **Shepler Thomas → Chieftain Development Company Inc → Chieftain #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:** Shepler Thomas → Chieftain #2; 1982-04-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Double P Inc → Chieftain #2; 1983-10-01 to 1986-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Perrine Robert F → Chieftain #2; 1983-10-01 to 1986-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Perrine Robert F → Double P Inc; 1983-10-01 to 1986-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Chieftain Development Company Inc → Chieftain #2; 1986-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shepler Thomas → Chieftain Development Company Inc; 1986-12-02 to current/open; source msha-controller-operator-history