# Relationship history for MSHA mine 0302008

Current hierarchy: **Philip D  Lentz; Robert G  Lentz → Lentz Sand and Gravel LLC → Thompson Gravel 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:** Philip D  Lentz et al → Thompson Gravel Pit; 2004-10-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lentz Sand and Gravel LLC → Thompson Gravel Pit; 2011-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip D  Lentz et al → Lentz Sand and Gravel LLC; 2011-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Lentz et al → Lentz Sand and Gravel LLC; 2011-05-25 to current/open; source msha-controller-operator-history