# Relationship history for MSHA mine 0203550

Current hierarchy: **Sam Grant Phillip Schippers → Custom Landscape Materials LLC. → NR-1**

- 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:** Koos H Schippers → NR-1; 1999-03-01 to 2023-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Sam Grant Phillip Schippers → NR-1; 2023-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Custom Landscape Materials LLC. → NR-1; 2026-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sam Grant Phillip Schippers → Custom Landscape Materials LLC.; 2026-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koos H Schippers → Custom Landscape Materials LLC.; 2026-08-06 to 2023-01-30; source msha-controller-operator-history