# Relationship history for MSHA mine 4402227

Current hierarchy: **Amlite Corp → Amlite Corp → Snowden Plant Or No 1 Mine & Mill**

- 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:** Hercules Inc → Snowden Plant Or No 1 Mine & Mill; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Hercules Inc → Snowden Plant Or No 1 Mine & Mill; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Hercules Inc → Hercules Inc; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Amlite Corp → Snowden Plant Or No 1 Mine & Mill; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amlite Corp → Snowden Plant Or No 1 Mine & Mill; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amlite Corp → Amlite Corp; 1978-12-01 to current/open; source msha-controller-operator-history