# Relationship history for MSHA mine 4407356

Current hierarchy: **Adams Construction Company → Adams Construction Company Division of Lawhorne Br → Otter River/Anderson Sand Plant**

- 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

- **controller_controls_mine:** Adams Construction Company → Otter River/Anderson Sand Plant; 1983-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adams Construction Company Division of Lawhorne Br → Otter River/Anderson Sand Plant; 2015-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Construction Company → Adams Construction Company Division of Lawhorne Br; 2015-10-27 to current/open; source msha-controller-operator-history