# Relationship history for MSHA mine 0301823

Current hierarchy: **Philip D  Lentz; Robert G  Lentz → Lentz Sand & Gravel LLC → Lentz Sand & Gravel LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Philip D  Lentz et al → Lentz Sand & Gravel LLC; 1998-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lentz Construction Company Inc → Lentz Sand & Gravel LLC; 2000-05-01 to 2010-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Philip D  Lentz et al → Lentz Construction Company Inc; 2000-05-01 to 2010-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Lentz et al → Lentz Construction Company Inc; 2000-05-01 to 2010-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Philip D  Lentz et al → Lentz Sand & Gravel LLC; 2004-10-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lentz Sand & Gravel LLC → Lentz Sand & Gravel LLC; 2010-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip D  Lentz et al → Lentz Sand & Gravel LLC; 2010-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Lentz et al → Lentz Sand & Gravel LLC; 2010-01-06 to current/open; source msha-controller-operator-history