# Relationship history for MSHA mine 3609982

Current hierarchy: **Michael D  Austin → Austin Sand & Gravel → Prattville Quarry**

- 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

- **controller_controls_mine:** John  Insinger → Prattville Quarry; 2009-05-15 to 2024-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Insinger Excavating Inc. → Prattville Quarry; 2011-12-14 to 2026-09-22; source msha-controller-operator-history
- **controller_controls_operator:** John  Insinger → Insinger Excavating Inc.; 2011-12-14 to 2024-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Austin → Prattville Quarry; 2014-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher J Insinger → Prattville Quarry; 2024-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher J Insinger → Insinger Excavating Inc.; 2024-02-08 to 2026-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Austin Sand & Gravel → Prattville Quarry; 2026-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Austin → Austin Sand & Gravel; 2026-09-23 to current/open; source msha-controller-operator-history