# Relationship history for MSHA mine 2300774

Current hierarchy: **Paul L  Roberts → Park Bend Company → Park Bend Company**

- 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:** K C Quarries Company → Park Bend Company; 1979-01-01 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Hanes William C → Park Bend Company; 1979-01-01 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Hanes William C → K C Quarries Company; 1979-01-01 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Paul L  Roberts → Park Bend Company; 1983-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Park Bend Company → Park Bend Company; 1983-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul L  Roberts → Park Bend Company; 1983-06-24 to current/open; source msha-controller-operator-history