# Relationship history for MSHA mine 4703227

Current hierarchy: **Glenn  Kafka → Kafka Road Materials, LLC. → Kafka Road Materials**

- 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:** Glenn  Kafka et al → Kafka Road Materials; 1984-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ridge View Granite Company LLC → Kafka Road Materials; 1999-11-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lori A  Baumann et al → Kafka Road Materials; 1999-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lori A  Baumann et al → Ridge View Granite Company LLC; 1999-11-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** George S  Baumann et al → Ridge View Granite Company LLC; 1999-11-01 to 2022-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Kafka Granite LLC → Kafka Road Materials; 2023-01-01 to 2023-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Glenn  Kafka et al → Kafka Granite LLC; 2023-01-01 to 2023-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Beverly  Kafka et al → Kafka Granite LLC; 2023-01-01 to 2023-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Kafka Road Materials LLC → Kafka Road Materials; 2023-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glenn  Kafka → Kafka Road Materials; 2023-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenn  Kafka → Kafka Road Materials LLC; 2023-01-19 to current/open; source msha-controller-operator-history