# Relationship history for MSHA mine 4500805

Current hierarchy: **Holcim Ltd → Lafarge North America Inc → Seattle 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:** Ideal Basic Industries-Cement Division → Seattle Plant; 1950-01-01 to 1989-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Ideal Basic Industries Inc → Seattle Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ideal Basic Industries Inc → Ideal Basic Industries-Cement Division; 1950-01-01 to 1989-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Seattle Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Seattle Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holnam Inc → Seattle Plant; 1989-06-16 to 1998-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holnam Inc; 1989-06-16 to 1998-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → Seattle Plant; 1998-10-16 to 2002-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1998-10-16 to 2002-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Seattle Plant; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc → Seattle Plant; 2002-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc; 2002-04-11 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Seattle Plant; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Inc; 2015-07-10 to current/open; source msha-controller-operator-history