# Relationship history for MSHA mine 0203365

Current hierarchy: **Forrest  Gressley; Tamara  Gressley → Tonto Rock Products LLC. → Gressley 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

- **operator_operates_mine:** Tonto Rock Products LLC. → Gressley Pit; 2016-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tamara  Gressley et al → Gressley Pit; 2016-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tamara  Gressley et al → Tonto Rock Products LLC.; 2016-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Forrest  Gressley et al → Tonto Rock Products LLC.; 2016-08-10 to current/open; source msha-controller-operator-history