# Relationship history for MSHA mine 0503269

Current hierarchy: **Arapahoe County-Co → Arapahoe County Road & Bridge → ARAPAHOE COUNTY PIT**

- 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 → ARAPAHOE COUNTY PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arapahoe County → ARAPAHOE COUNTY PIT; 1979-01-01 to 1988-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Arapahoe County-Co → ARAPAHOE COUNTY PIT; 1979-01-01 to 1988-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Arapahoe County-Co → Arapahoe County; 1979-01-01 to 1988-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Kiewit Western Company → ARAPAHOE COUNTY PIT; 1988-11-16 to 1991-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Kiewit Western Company; 1988-11-16 to 1991-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Arapahoe County Road & Bridge → ARAPAHOE COUNTY PIT; 1991-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arapahoe County-Co → ARAPAHOE COUNTY PIT; 1991-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arapahoe County-Co → Arapahoe County Road & Bridge; 1991-04-09 to current/open; source msha-controller-operator-history