# Relationship history for MSHA mine 0503144

Current hierarchy: **Peter Kiewit Sons' Inc → Kiewit Western Company → Larkspur Pits 1 & 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:** Peter Kiewit Sons' Inc → Larkspur Pits 1 & 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glen R  Ramsour → Larkspur Pits 1 & 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ramsour Brothers Inc → Larkspur Pits 1 & 2; 1978-03-09 to 1984-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Glen R  Ramsour → Ramsour Brothers Inc; 1978-03-09 to 1984-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Gil-Son Paving Company → Larkspur Pits 1 & 2; 1984-01-12 to 1985-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Gile Charles L → Larkspur Pits 1 & 2; 1984-01-12 to 1985-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Gile Charles L → Gil-Son Paving Company; 1984-01-12 to 1985-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Kiewit Western Company → Larkspur Pits 1 & 2; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Kiewit Western Company; 1985-05-01 to current/open; source msha-controller-operator-history