# Relationship history for MSHA mine 2401415

Current hierarchy: **Richard  Hoffman; Jim  Evenson → E&H ASPHALT → MERRIMAN QUARRY**

- 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:** Peter Kiewit Sons' Inc → MERRIMAN QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peter Kiewit Sons' Company → MERRIMAN QUARRY; 1978-03-09 to 2026-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Peter Kiewit Sons' Company; 1978-03-09 to 2026-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Hoffman et al → MERRIMAN QUARRY; 2025-05-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E&H Asphalt → MERRIMAN QUARRY; 2026-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Hoffman et al → E&H Asphalt; 2026-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Evenson et al → E&H Asphalt; 2026-09-10 to current/open; source msha-controller-operator-history