# Relationship history for MSHA mine 4105115

Current hierarchy: **Curtis Glenn Thurman → Thurman Transportation Inc. → 317 Sand 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

- **controller_controls_mine:** Curtis Glenn Thurman et al → 317 Sand Pit; 1990-02-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thurman Transportation Inc. → 317 Sand Pit; 2015-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis Glenn Thurman et al → Thurman Transportation Inc.; 2015-04-01 to current/open; source msha-controller-operator-history