# Relationship history for MSHA mine 3002971

Current hierarchy: **Michael D  Austin → Austin Excavating & Paving → Peterson 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:** Peterson Sand & Gravel → Peterson Sand & Gravel; 1990-07-01 to 2020-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Florence  Peterson → Peterson Sand & Gravel; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florence  Peterson → Peterson Sand & Gravel; 1990-07-01 to 2020-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Austin → Peterson Sand & Gravel; 2014-10-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Austin Excavating & Paving → Peterson Sand & Gravel; 2020-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Austin → Austin Excavating & Paving; 2020-08-17 to current/open; source msha-controller-operator-history