# Relationship history for MSHA mine 3503727

Current hierarchy: **Cassie E Mendoza; Marcos E Mendoza → D.K. Quarries → Portable #4**

- 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:** Dan  Kauffman → Portable #4; 2001-09-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D. K. Quarries, Inc. → Portable #4; 2009-11-16 to 2025-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Kauffman → D. K. Quarries, Inc.; 2009-11-16 to 2025-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Cassie E Mendoza et al → Portable #4; 2023-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D.K. Quarries → Portable #4; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cassie E Mendoza et al → D.K. Quarries; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcos E Mendoza et al → D.K. Quarries; 2025-06-12 to current/open; source msha-controller-operator-history