# Relationship history for MSHA mine 1102856

Current hierarchy: **Beverly J  Ropp → Colona Sand & Excavating Inc → Colona Pit (Heeren 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Beverly J  Ropp → Colona Pit (Heeren Pit); 1984-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colona Sand & Excavating Inc → Colona Pit (Heeren Pit); 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beverly J  Ropp → Colona Sand & Excavating Inc; 1987-06-01 to current/open; source msha-controller-operator-history