# Relationship history for MSHA mine 3102386

Current hierarchy: **Richard Gary  Thompson → T R Equipment Company → The Sandlot**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-28T11:51:57.825640+00:00

## Valid-time edges

- **operator_operates_mine:** T R Equipment Company → The Sandlot; 2026-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard Gary  Thompson et al → The Sandlot; 2026-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard Gary  Thompson et al → T R Equipment Company; 2026-10-13 to current/open; source msha-controller-operator-history