# Relationship history for MSHA mine 0404708

Current hierarchy: **Teichert Inc → Teichert Aggregates → Boca 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:** Teichert Inc → Boca Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cinder Materials Inc → Boca Quarry; 1984-06-01 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_mine:** William H  Dearman → Boca Quarry; 1984-06-01 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_operator:** William H  Dearman → Cinder Materials Inc; 1984-06-01 to 1998-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Jim Dobbas Inc → Boca Quarry; 1998-05-01 to 2001-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Jim  Dobbas → Boca Quarry; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Dobbas → Jim Dobbas Inc; 1998-05-01 to 2001-10-25; source msha-controller-operator-history
- **operator_operates_mine:** R & J Joy Inc. DBA Joy Engineering → Boca Quarry; 2001-10-26 to 2005-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Joy → Boca Quarry; 2001-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Joy → R & J Joy Inc. DBA Joy Engineering; 2001-10-26 to 2005-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Teichert Aggregates → Boca Quarry; 2005-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teichert Inc → Teichert Aggregates; 2005-06-14 to current/open; source msha-controller-operator-history