# Relationship history for MSHA mine 4703032

Current hierarchy: **Holmstrom Iver → Holmstrom Construction → Crusher No 1**

- 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

- **operator_operates_mine:** Holmstrom Construction → Crusher No 1; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holmstrom Iver → Crusher No 1; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holmstrom Iver → Holmstrom Construction; 1994-09-01 to current/open; source msha-controller-operator-history