# Relationship history for MSHA mine 0504330

Current hierarchy: **Holcim Ltd → Lafarge West Incorporated → Northern Portable Plant #5**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Plains Aggregate Company → Northern Portable Plant #5; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Plains Aggregate Company → Northern Portable Plant #5; 1988-01-01 to 1989-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Plains Aggregate Company → Plains Aggregate Company; 1988-01-01 to 1989-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Northern Portable Plant #5; 1988-06-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western-Mobile Northern Inc → Northern Portable Plant #5; 1989-05-26 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western-Mobile Northern Inc; 1989-05-26 to 1998-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Northern Inc → Northern Portable Plant #5; 1998-02-11 to 2002-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Northern Portable Plant #5; 1998-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile Northern Inc; 1998-02-11 to 2002-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge West Incorporated → Northern Portable Plant #5; 2002-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Northern Portable Plant #5; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge West Incorporated; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Northern Portable Plant #5; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge West Incorporated; 2015-07-10 to current/open; source msha-controller-operator-history