# Relationship history for MSHA mine 1002372

Current hierarchy: **Steven C  Heaton → Western Construction, Inc. → Portable Crusher #5**

- 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:** Richard J  Heaton → Portable Crusher #5; 1950-01-01 to 2024-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Steven C  Heaton → Portable Crusher #5; 2024-09-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Construction, Inc. → Portable Crusher #5; 2025-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven C  Heaton → Western Construction, Inc.; 2025-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Heaton → Western Construction, Inc.; 2025-01-17 to 2024-09-09; source msha-controller-operator-history