# Relationship history for MSHA mine 3003584

Current hierarchy: **Larry A  Schaefer → Schaefer Enterprises of Deposit Inc → Schaefers Sand 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:** Larry A  Schaefer et al → Schaefers Sand Pit; 2002-09-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schaefer Enterprises of Deposit Inc → Schaefers Sand Pit; 2007-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry A  Schaefer et al → Schaefer Enterprises of Deposit Inc; 2007-04-23 to current/open; source msha-controller-operator-history