# Relationship history for MSHA mine 2600927

Current hierarchy: **BRAD R  AMUSSEN → BLT Ready Mix Inc. → BLT Ready Mix & Aggregates**

- 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:** Hawthorne Materials Inc → BLT Ready Mix & Aggregates; 1980-05-01 to 2002-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Phillipe Pat → BLT Ready Mix & Aggregates; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillipe Pat → Hawthorne Materials Inc; 1980-05-01 to 2002-04-30; source msha-controller-operator-history
- **operator_operates_mine:** BLT Ready Mix Inc. → BLT Ready Mix & Aggregates; 2002-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** BRAD R  AMUSSEN → BLT Ready Mix & Aggregates; 2002-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BRAD R  AMUSSEN → BLT Ready Mix Inc.; 2002-05-01 to current/open; source msha-controller-operator-history