# Relationship history for MSHA mine 4201670

Current hierarchy: **Pencol Mining Company → Pencol Mining Company → Ekker Placer**

- 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:** Ekker Ted → Ekker Placer; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ted Ekker → Ekker Placer; 1980-04-01 to 1980-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Ekker Ted → Ted Ekker; 1980-04-01 to 1980-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Pencol Mining Company → Ekker Placer; 1980-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pencol Mining Company → Ekker Placer; 1980-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pencol Mining Company → Pencol Mining Company; 1980-11-15 to current/open; source msha-controller-operator-history