# Relationship history for MSHA mine 4402833

Current hierarchy: **Hines Bobby → Sussex Materials Inc → Old Adams Stony Creek 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Acco Stone Company → Old Adams Stony Creek Sand Plant; 1950-01-01 to 1986-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Adams Construction Company → Old Adams Stony Creek Sand Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Construction Company → Acco Stone Company; 1950-01-01 to 1986-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Sussex Materials Inc → Old Adams Stony Creek Sand Plant; 1986-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hines Bobby → Old Adams Stony Creek Sand Plant; 1986-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hines Bobby → Sussex Materials Inc; 1986-05-13 to current/open; source msha-controller-operator-history