# Relationship history for MSHA mine 1103127

Current hierarchy: **Stephen D  Bauch → Roscoe Rock and Sand, Inc. → Roscoe Rock and Sand, Inc. (Durand)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Stephen D  Bauch → Roscoe Rock and Sand, Inc. (Durand); 1996-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roscoe Rock and Sand, Inc. → Roscoe Rock and Sand, Inc. (Durand); 2004-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen D  Bauch → Roscoe Rock and Sand, Inc.; 2004-04-20 to current/open; source msha-controller-operator-history