# Relationship history for MSHA mine 4703890

Current hierarchy: **Roderick C Hopkins → Hopkins Sand & Gravel → Crusher #2**

- 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:** Roderick C Hopkins et al → Crusher #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hopkins Sand & Gravel → Crusher #2; 2021-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roderick C Hopkins et al → Hopkins Sand & Gravel; 2021-03-25 to current/open; source msha-controller-operator-history