# Relationship history for MSHA mine 4503314

Current hierarchy: **Eucon Corporation → Atlas Sand & Rock Inc → Evans Road Pit**

- 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 → Evans Road Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C-Port Sand & Gravel Inc → Evans Road Pit; 1994-02-01 to 2002-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Rob  Courville → Evans Road Pit; 1994-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rob  Courville → C-Port Sand & Gravel Inc; 1994-02-01 to 2002-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Atlas Sand & Rock Inc → Evans Road Pit; 2002-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → Atlas Sand & Rock Inc; 2002-01-25 to current/open; source msha-controller-operator-history