# Relationship history for MSHA mine 1601205

Current hierarchy: **Boh Brothers Construction Company Llc → Boh Brothers Construction Company Llc → Boh Brothers Northshore Asphalt 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Michael A  Bush  et al → Boh Brothers Northshore Asphalt Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boh Brothers Construction Company Llc → Boh Brothers Northshore Asphalt Plant; 1986-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bush Construction Company Inc → Boh Brothers Northshore Asphalt Plant; 1990-07-01 to 1996-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Bush  et al → Bush Construction Company Inc; 1990-07-01 to 1996-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Dunn Roadbuilders Llc → Boh Brothers Northshore Asphalt Plant; 1996-09-01 to 1998-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Jaime S M  French → Boh Brothers Northshore Asphalt Plant; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jaime S M  French → Dunn Roadbuilders Llc; 1996-09-01 to 1998-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Asphalt Company Llc → Boh Brothers Northshore Asphalt Plant; 1998-06-01 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_mine:** R J Billingsley Inc et al → Boh Brothers Northshore Asphalt Plant; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R J Billingsley Inc et al → Mobile Asphalt Company Llc; 1998-06-01 to 2000-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Boh Brothers Construction Company Llc → Boh Brothers Northshore Asphalt Plant; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boh Brothers Construction Company Llc → Boh Brothers Construction Company Llc; 2000-07-01 to current/open; source msha-controller-operator-history