# Relationship history for MSHA mine 2402300

Current hierarchy: **Riley  Mytty → Western Excavating → South 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:** 93 Sand and Gravel → South Pit; 2002-08-27 to 2005-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Al  Gruebele Jr et al → South Pit; 2002-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Al  Gruebele Jr et al → 93 Sand and Gravel; 2002-08-27 to 2005-01-03; source msha-controller-operator-history
- **operator_operates_mine:** Western Excavating → South Pit; 2005-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin W  Mytty → South Pit; 2005-01-04 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Kevin W  Mytty → Western Excavating; 2005-01-04 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Riley  Mytty → South Pit; 2025-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riley  Mytty → Western Excavating; 2025-04-01 to current/open; source msha-controller-operator-history