# Relationship history for MSHA mine 4605104

Current hierarchy: **Kelley Paul W → P W K Development Inc → P W K No 1 Surface**

- 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

- **operator_operates_mine:** P W K Development Inc → P W K No 1 Surface; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelley Paul W → P W K No 1 Surface; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelley Paul W → P W K Development Inc; 1976-01-01 to current/open; source msha-controller-operator-history