# Relationship history for MSHA mine 2602837

Current hierarchy: **Sterling Infrastructure Inc; Richard H  Buenting → Pershing Sand and Gravel → Pershing 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Richard H  Buenting et al → Pershing Pit; 2009-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M&M Sand & Gravel → Pershing Pit; 2018-09-20 to 2026-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Michael Wayne  Maita → Pershing Pit; 2018-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael Wayne  Maita → M&M Sand & Gravel; 2018-09-20 to 2026-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Pershing Sand and Gravel → Pershing Pit; 2026-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Buenting et al → Pershing Sand and Gravel; 2026-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling Infrastructure Inc et al → Pershing Sand and Gravel; 2026-06-29 to current/open; source msha-controller-operator-history