# Relationship history for MSHA mine 1901251

Current hierarchy: **Richard  Androlewicz → Rampco Construction Co., Inc. → Sturbridge 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:** Richard  Androlewicz → Sturbridge Pit; 2007-07-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rampco Construction Co., Inc. → Sturbridge Pit; 2017-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Androlewicz → Rampco Construction Co., Inc.; 2017-03-29 to current/open; source msha-controller-operator-history