# Relationship history for MSHA mine 2002702

Current hierarchy: **TOM  THOMAS → Consumers Sand & Gravel Company → Cedar Rapids Plant 1**

- 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:** TOM  THOMAS  ET AL → Cedar Rapids Plant 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Consumers Sand & Gravel Company → Cedar Rapids Plant 1; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TOM  THOMAS  ET AL → Consumers Sand & Gravel Company; 1983-07-01 to current/open; source msha-controller-operator-history