# Relationship history for MSHA mine 3200195

Current hierarchy: **Mike Roy Gowan; Milton R Gowan → Gowan Construction Inc → Sheyenne 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:** Sheyenne Sand & Gravel Inc → Sheyenne Pit; 1950-01-01 to 1988-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Virgil A  Berglund → Sheyenne Pit; 1950-01-01 to 1988-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Virgil A  Berglund → Sheyenne Sand & Gravel Inc; 1950-01-01 to 1988-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Sheyenne Sand & Gravel Inc → Sheyenne Pit; 1988-08-09 to 1994-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Kost Brothers Inc → Sheyenne Pit; 1988-08-09 to 1994-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Kost Brothers Inc → Sheyenne Sand & Gravel Inc; 1988-08-09 to 1994-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minndak Inc → Sheyenne Pit; 1994-03-01 to 1997-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Camas Plc → Sheyenne Pit; 1994-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Camas Plc → Camas Minndak Inc; 1994-03-01 to 1997-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minndak Inc → Sheyenne Pit; 1997-05-14 to 2002-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Sheyenne Pit; 1997-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Camas Minndak Inc; 1997-05-14 to 2002-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Sheyenne Pit; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries Inc → Sheyenne Pit; 2002-03-07 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries Inc; 2002-03-07 to 2003-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries-North Central Region Inc → Sheyenne Pit; 2003-11-26 to 2009-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Sheyenne Pit; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries-North Central Region Inc; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Sheyenne Pit; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries Inc; 2009-04-30 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries-North Central Region Inc; 2009-04-30 to 2009-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Gowan Construction Inc → Sheyenne Pit; 2009-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Milton R  Gowan → Sheyenne Pit; 2009-07-24 to 2025-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Milton R  Gowan → Gowan Construction Inc; 2009-07-24 to 2025-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Sheyenne Pit; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries Inc; 2015-07-10 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries-North Central Region Inc; 2015-07-10 to 2009-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Milton R Gowan et al → Sheyenne Pit; 2025-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milton R Gowan et al → Gowan Construction Inc; 2025-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike Roy Gowan et al → Gowan Construction Inc; 2025-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Sheyenne Pit; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries Inc; 2025-06-23 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries-North Central Region Inc; 2025-06-23 to 2009-07-23; source msha-controller-operator-history