# Relationship history for MSHA mine 1400435

Current hierarchy: **Jackson Albert Jr → Consumers Sand Company Inc → River 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Jackson Albert Jr → River Sand Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Sand Company Inc → River Sand Plant; 1950-01-01 to 1982-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Grecian William D → River Sand Plant; 1950-01-01 to 1982-11-11; source msha-controller-operator-history
- **controller_controls_operator:** Grecian William D → River Sand Company Inc; 1950-01-01 to 1982-11-11; source msha-controller-operator-history
- **operator_operates_mine:** Consumers Sand Company Inc → River Sand Plant; 1982-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Albert Jr → Consumers Sand Company Inc; 1982-11-12 to current/open; source msha-controller-operator-history