# Relationship history for MSHA mine 5001532

Current hierarchy: **J Dana  Pruhs → Quality Sand & Gravel LLC → Quality Sand & Gravel L.L.C.**

- 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

- **operator_operates_mine:** Quality Sand & Gravel → Quality Sand & Gravel L.L.C.; 1987-08-01 to 1999-05-25; source msha-controller-operator-history
- **controller_controls_mine:** John I  Waters → Quality Sand & Gravel L.L.C.; 1987-08-01 to 1999-05-25; source msha-controller-operator-history
- **controller_controls_operator:** John I  Waters → Quality Sand & Gravel; 1987-08-01 to 1999-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Quality Sand & Gravel LLC → Quality Sand & Gravel L.L.C.; 1999-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J Dana  Pruhs → Quality Sand & Gravel L.L.C.; 1999-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Dana  Pruhs → Quality Sand & Gravel LLC; 1999-05-26 to current/open; source msha-controller-operator-history