# Relationship history for MSHA mine 2700357

Current hierarchy: **Calvin J  Coleman → Alvin J Coleman & Son Inc → Crusher 3**

- 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:** Calvin J  Coleman → Crusher 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alvin J Coleman & Son Inc → Crusher 3; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calvin J  Coleman → Alvin J Coleman & Son Inc; 2000-07-01 to current/open; source msha-controller-operator-history