# Relationship history for MSHA mine 3003323

Current hierarchy: **Thomas  Poley; Ryan  Calkin → TSR Materials Corp. → Poley Sand & Gravel**

- 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

- **operator_operates_mine:** Hauser Sand & Gravel → Poley Sand & Gravel; 2000-04-01 to 2003-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Allen  Hauser → Poley Sand & Gravel; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen  Hauser → Hauser Sand & Gravel; 2000-04-01 to 2003-11-30; source msha-controller-operator-history
- **operator_operates_mine:** TSR Materials Corp. → Poley Sand & Gravel; 2003-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Poley Et Al → Poley Sand & Gravel; 2003-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Poley Et Al → TSR Materials Corp.; 2003-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Calkin Et Al → TSR Materials Corp.; 2003-12-01 to current/open; source msha-controller-operator-history