# Relationship history for MSHA mine 2401400

Current hierarchy: **Andrew J  Mathison → Casino Creek Concrete Inc → Portable Crusher**

- 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:** Robert Tindall Contractor → Portable Crusher; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Tindall Robert → Portable Crusher; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Tindall Robert → Robert Tindall Contractor; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Casino Creek Concrete → Portable Crusher; 1979-05-01 to 1985-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Guy R  Tindall → Portable Crusher; 1979-05-01 to 1985-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Guy R  Tindall → Casino Creek Concrete; 1979-05-01 to 1985-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Casino Creek Concrete Inc → Portable Crusher; 1985-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Mathison → Portable Crusher; 1985-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Mathison → Casino Creek Concrete Inc; 1985-11-01 to current/open; source msha-controller-operator-history