# Relationship history for MSHA mine 1300929

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → TCC Materials → TCC Materials Muscatine Aggregates**

- 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

- **operator_operates_mine:** Acme Fuel & Material Company → TCC Materials Muscatine Aggregates; 1950-01-01 to 2012-08-06; source msha-controller-operator-history
- **controller_controls_mine:** W G Block Company Inc → TCC Materials Muscatine Aggregates; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W G Block Company Inc → Acme Fuel & Material Company; 1950-01-01 to 2012-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Acme Materials Co → TCC Materials Muscatine Aggregates; 2012-08-07 to 2021-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Brian  Hahn et al → TCC Materials Muscatine Aggregates; 2012-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Hahn et al → Acme Materials Co; 2012-08-07 to 2021-06-09; source msha-controller-operator-history
- **operator_operates_mine:** TCC Materials → TCC Materials Muscatine Aggregates; 2021-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim L Becken et al → TCC Materials Muscatine Aggregates; 2021-06-10 to 2025-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → TCC Materials; 2021-06-10 to 2025-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → TCC Materials; 2021-06-10 to 2025-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Tim L  Becken et al → TCC Materials Muscatine Aggregates; 2025-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L  Becken et al → TCC Materials; 2025-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorwald L  Becken et al → TCC Materials; 2025-05-06 to current/open; source msha-controller-operator-history