# Relationship history for MSHA mine 4103769

Current hierarchy: **Elmer P  Bittner; Delora J  Bittner → Bittner Sand Inc → BITTNER SAND INC**

- 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

- **operator_operates_mine:** Bittner Sand Inc → BITTNER SAND INC; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Delora J  Bittner  et al → BITTNER SAND INC; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delora J  Bittner  et al → Bittner Sand Inc; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elmer P  Bittner  et al → Bittner Sand Inc; 1993-05-01 to current/open; source msha-controller-operator-history