# Relationship history for MSHA mine 2901955

Current hierarchy: **Dennis  Muncrief → CSC, Inc. → Portable Crusher & Screen**

- 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:** Dennis  Muncrief → Portable Crusher & Screen; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Verdugo Contract Hauling & Backhoe Service → Portable Crusher & Screen; 1984-04-01 to 1986-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Lorenzo  Verdugo → Portable Crusher & Screen; 1984-04-01 to 1986-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Lorenzo  Verdugo → Verdugo Contract Hauling & Backhoe Service; 1984-04-01 to 1986-05-18; source msha-controller-operator-history
- **operator_operates_mine:** CSC, Inc. → Portable Crusher & Screen; 1986-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Muncrief → CSC, Inc.; 1986-05-19 to current/open; source msha-controller-operator-history