# Relationship history for MSHA mine 0504507

Current hierarchy: **Holcim Ltd → Holcim (US), Inc → Customer Technical Service Lab**

- 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

- **controller_controls_mine:** Holcim Ltd → Customer Technical Service Lab; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holnam Inc → Customer Technical Service Lab; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holnam Inc; 1992-10-01 to current/open; source msha-controller-operator-history