# Relationship history for MSHA mine 4103934

Current hierarchy: **Andy  Closner; Albert  Closner II → Aggrecon Concrete Inc → AGGRECON**

- 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:** Albert  Closner → AGGRECON; 1993-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & B Contractors Inc → AGGRECON; 1997-01-01 to 1999-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Albert  Closner → J & B Contractors Inc; 1997-01-01 to 1999-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Aggrecon Concrete Inc → AGGRECON; 1999-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert  Closner II  et al → AGGRECON; 1999-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert  Closner II  et al → Aggrecon Concrete Inc; 1999-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andy  Closner  et al → Aggrecon Concrete Inc; 1999-11-03 to current/open; source msha-controller-operator-history