# Relationship history for MSHA mine 4104892

Current hierarchy: **Gary D  Thompson; Jerry D  Thompson → T & T Materials → T & T Materials**

- 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:** T & T Materials → T & T Materials; 2011-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary D  Thompson et al → T & T Materials; 2011-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary D  Thompson et al → T & T Materials; 2011-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry D  Thompson et al → T & T Materials; 2011-07-12 to current/open; source msha-controller-operator-history