# Relationship history for MSHA mine 2103105

Current hierarchy: **Thomas W  Dwyer → Isak Hansen & Sons Inc → Screening Plant**

- 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:** Isak Hansen & Sons Inc → Screening Plant; 1995-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hansen Irving R → Screening Plant; 1995-06-01 to 2000-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Hansen Irving R → Isak Hansen & Sons Inc; 1995-06-01 to 2000-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Thomas W  Dwyer → Screening Plant; 2000-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W  Dwyer → Isak Hansen & Sons Inc; 2000-11-30 to current/open; source msha-controller-operator-history