# Relationship history for MSHA mine 4501589

Current hierarchy: **Krieg Darlyne → Valley Ready Mix Inc → VALLEY READY MIX 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

- **operator_operates_mine:** Valley Ready Mix Concrete Company → VALLEY READY MIX PIT; 1950-01-01 to 1989-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Martin  Drollinger  et al → VALLEY READY MIX PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin  Drollinger  et al → Valley Ready Mix Concrete Company; 1950-01-01 to 1989-11-24; source msha-controller-operator-history
- **controller_controls_operator:** William  Douglas  et al → Valley Ready Mix Concrete Company; 1950-01-01 to 1989-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Valley Ready Mix Inc → VALLEY READY MIX PIT; 1989-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Krieg Darlyne → VALLEY READY MIX PIT; 1989-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Krieg Darlyne → Valley Ready Mix Inc; 1989-11-25 to current/open; source msha-controller-operator-history