# Relationship history for MSHA mine 2003707

Current hierarchy: **Michael L  Humphries → Mid Thumb Materials, Inc → LOBDELL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mid Thumb Materials, Inc → LOBDELL; 2026-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael L  Humphries → LOBDELL; 2026-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael L  Humphries → Mid Thumb Materials, Inc; 2026-05-20 to current/open; source msha-controller-operator-history