# Relationship history for MSHA mine 3004036

Current hierarchy: **Harry  Harmer → HARMER CONSTRUCTION → 2017 SANDVIK CRUSHER QH331**

- 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

- **controller_controls_mine:** Harry  Harmer → 2017 SANDVIK CRUSHER QH331; 1990-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harmer Construction → 2017 SANDVIK CRUSHER QH331; 2019-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry  Harmer → Harmer Construction; 2019-07-10 to current/open; source msha-controller-operator-history