# Relationship history for MSHA mine 4202160

Current hierarchy: **Mark D  Dotson → West Hills Excavating Llc → GRAVEL PIT**

- 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:** West Hills Excavating Llc → GRAVEL PIT; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark D  Dotson → GRAVEL PIT; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark D  Dotson → West Hills Excavating Llc; 1997-01-01 to current/open; source msha-controller-operator-history