# Relationship history for MSHA mine 2900822

Current hierarchy: **Don  Eker → Eker Brothers, Inc. → SANTA FE RIVER PIT**

- 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:** Central Concrete Products Inc → SANTA FE RIVER PIT; 1950-01-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** William L  Donnelly → SANTA FE RIVER PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William L  Donnelly → Central Concrete Products Inc; 1950-01-01 to 2001-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Eker Brothers, Inc. → SANTA FE RIVER PIT; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don  Eker et al → SANTA FE RIVER PIT; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Eker et al → Eker Brothers, Inc.; 2002-01-01 to current/open; source msha-controller-operator-history