# Relationship history for MSHA mine 4407309

Current hierarchy: **Tommy  Lyons → T & M Contractors, Inc. → Dismal Creek GOB Pile**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** T & M Contractors, Inc. → Dismal Creek GOB Pile; 2013-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tommy  Lyons → Dismal Creek GOB Pile; 2013-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tommy  Lyons → T & M Contractors, Inc.; 2013-05-01 to current/open; source msha-controller-operator-history