# Relationship history for MSHA mine 4503373

Current hierarchy: **Eucon Corporation → DeAtley Crushing Company → Sprague 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:** Eucon Corporation → Sprague Quarry; 1983-06-01 to 2009-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Mainline Rock & Ballast Inc → Sprague Quarry; 1998-02-01 to 2020-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Eucon Corporation → Sprague Quarry; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → Mainline Rock & Ballast Inc; 1998-02-01 to 2020-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Brien  DeAtley → Sprague Quarry; 2009-01-28 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Eucon Corporation → Sprague Quarry; 2010-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DeAtley Crushing Company → Sprague Quarry; 2020-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brien  DeAtley → DeAtley Crushing Company; 2020-01-28 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → DeAtley Crushing Company; 2020-01-28 to 2009-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → DeAtley Crushing Company; 2020-01-28 to current/open; source msha-controller-operator-history