# Relationship history for MSHA mine 2103459

Current hierarchy: **Joseph A  Rumpca → Rumpca Excavating Inc. → Power Screen #1**

- 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:** Joseph A  Rumpca → Power Screen #1; 1980-11-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rumpca Excavating Inc. → Power Screen #1; 2004-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph A  Rumpca → Rumpca Excavating Inc.; 2004-07-27 to current/open; source msha-controller-operator-history