# Relationship history for MSHA mine 3502841

Current hierarchy: **Cassie E Mendoza; Marcos E Mendoza → D.K. Quarries → Shenk Quarry**

- 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:** Lloyd  Town et al → Shenk Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C C Meisel Company Inc → Shenk Quarry; 1978-03-09 to 1999-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd  Town et al → C C Meisel Company Inc; 1978-03-09 to 1999-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Kauffman → Shenk Quarry; 1994-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kauffman Quarries Inc → Shenk Quarry; 1999-06-09 to 2002-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Kauffman → Kauffman Quarries Inc; 1999-06-09 to 2002-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Kauffman → Shenk Quarry; 2001-09-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D K  Quarries Inc → Shenk Quarry; 2002-09-19 to 2023-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Kauffman → D K  Quarries Inc; 2002-09-19 to 2023-02-28; source msha-controller-operator-history
- **operator_operates_mine:** D.K. Quarries → Shenk Quarry; 2023-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cassie E Mendoza et al → Shenk Quarry; 2023-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cassie E Mendoza et al → D.K. Quarries; 2023-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcos E Mendoza et al → D.K. Quarries; 2023-03-01 to current/open; source msha-controller-operator-history