# Relationship history for MSHA mine 4702772

Current hierarchy: **Glenn  Kafka → Kafka Road Materials LLC → Kafka Road Materials Crusher**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Kafka Granite → Kafka Road Materials Crusher; 1984-08-01 to 2024-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Beverly  Kafka et al → Kafka Road Materials Crusher; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beverly  Kafka et al → Kafka Granite; 1984-08-01 to 2024-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Glenn  Kafka et al → Kafka Granite; 1984-08-01 to 2024-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Glenn  Kafka → Kafka Road Materials Crusher; 2023-01-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kafka Road Materials LLC → Kafka Road Materials Crusher; 2024-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenn  Kafka → Kafka Road Materials LLC; 2024-01-22 to current/open; source msha-controller-operator-history