# Relationship history for MSHA mine 2500183

Current hierarchy: **Tyler  Kimzey → Pine Bluffs Gravel & Excavating → Lexington 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:** Anderson Sand & Gravel → Lexington Pit; 1950-01-01 to 1996-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Glenn C  Anderson → Lexington Pit; 1950-01-01 to 1996-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Glenn C  Anderson → Anderson Sand & Gravel; 1950-01-01 to 1996-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Anderson → Lexington Pit; 1996-08-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anderson Sand & Gravel → Lexington Pit; 1996-09-25 to 2017-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Anderson → Anderson Sand & Gravel; 1996-09-25 to 2017-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Tyler  Kimzey et al → Lexington Pit; 1999-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pine Bluffs Gravel & Excavating → Lexington Pit; 2017-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyler  Kimzey et al → Pine Bluffs Gravel & Excavating; 2017-03-03 to current/open; source msha-controller-operator-history