# Relationship history for MSHA mine 2602483

Current hierarchy: **Bodie  Frates; Mel  Westwood → Direct Grading & Paving → Thunder Bird Jaw 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:** Direct Grading & Paving → Thunder Bird Jaw Crusher; 2002-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mel  Westwood  et al → Thunder Bird Jaw Crusher; 2002-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mel  Westwood  et al → Direct Grading & Paving; 2002-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bodie  Frates  et al → Direct Grading & Paving; 2002-01-22 to current/open; source msha-controller-operator-history