# Relationship history for MSHA mine 1901100

Current hierarchy: **Ward  Hannula → Oiva Hannula & Sons Inc → ROUTE 58 PIT**

- 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:** Oiva Hannula & Sons Inc → ROUTE 58 PIT; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ward  Hannula → ROUTE 58 PIT; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ward  Hannula → Oiva Hannula & Sons Inc; 2001-06-01 to current/open; source msha-controller-operator-history