# Relationship history for MSHA mine 0103324

Current hierarchy: **Edwin J  Spence → BALDWIN SAND & GRAVEL, LLC. → BALDWIN SAND & GRAVEL, LLC.**

- 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

- **operator_operates_mine:** Baldwin Mining Co Inc → BALDWIN SAND & GRAVEL, LLC.; 2005-06-20 to 2013-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Schwartz et al → BALDWIN SAND & GRAVEL, LLC.; 2005-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Schwartz et al → Baldwin Mining Co Inc; 2005-06-20 to 2013-10-20; source msha-controller-operator-history
- **operator_operates_mine:** Baldwin Sand & Gravel, LLC. → BALDWIN SAND & GRAVEL, LLC.; 2013-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edwin J  Spence → BALDWIN SAND & GRAVEL, LLC.; 2013-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edwin J  Spence → Baldwin Sand & Gravel, LLC.; 2013-10-21 to current/open; source msha-controller-operator-history