# Relationship history for MSHA mine 4104634

Current hierarchy: **Amrize Ltd → Lattimore Materials Company LP → Woodlands Sand Plant #160**

- 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:** Lattimore Properties Inc → Woodlands Sand Plant #160; 1950-01-01 to 2011-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Frontier Aggregates LLC → Woodlands Sand Plant #160; 2006-12-15 to 2009-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Harper Industries → Woodlands Sand Plant #160; 2006-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harper Industries → Frontier Aggregates LLC; 2006-12-15 to 2009-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Lattimore Materials Company LP → Woodlands Sand Plant #160; 2009-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lattimore Properties Inc → Lattimore Materials Company LP; 2009-08-01 to 2011-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Woodlands Sand Plant #160; 2011-03-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lattimore Materials Company LP; 2011-03-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Woodlands Sand Plant #160; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lattimore Materials Company LP; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Woodlands Sand Plant #160; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Lattimore Materials Company LP; 2025-06-23 to current/open; source msha-controller-operator-history