# Relationship history for MSHA mine 3608933

Current hierarchy: **Jason T Burke → M M Quarries Inc → Burts Bros**

- 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:** Kevin & Grace Ives → Burts Bros; 2001-03-01 to 2005-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Ives et al → Burts Bros; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Ives et al → Kevin & Grace Ives; 2001-03-01 to 2005-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Grace  Ives et al → Kevin & Grace Ives; 2001-03-01 to 2005-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Rock Ridge Stone Inc. → Burts Bros; 2005-06-07 to 2015-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Chad H  Hollenbeck → Burts Bros; 2005-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad H  Hollenbeck → Rock Ridge Stone Inc.; 2005-06-07 to 2015-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Rock Ridge Stone → Burts Bros; 2015-06-02 to 2020-06-28; source msha-controller-operator-history
- **controller_controls_mine:** August F  DeLuca → Burts Bros; 2015-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** August F  DeLuca → Rock Ridge Stone; 2015-06-02 to 2020-06-28; source msha-controller-operator-history
- **operator_operates_mine:** M M Quarries Inc → Burts Bros; 2020-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason T Burke → Burts Bros; 2020-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason T Burke → M M Quarries Inc; 2020-06-29 to current/open; source msha-controller-operator-history