# Relationship history for MSHA mine 4607580

Current hierarchy: **Ramosa Associates 83-1 Inc-Sidford Mining Systems → Rocon Mining Company Lp → #1-A**

- 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:** Ramosa Associates 83-1 Inc-Sidford Mining Systems → #1-A; 1985-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rocon Mining Company Lp → #1-A; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramosa Associates 83-1 Inc-Sidford Mining Systems → Rocon Mining Company Lp; 1988-09-01 to current/open; source msha-controller-operator-history