# Relationship history for MSHA mine 3301440

Current hierarchy: **John D  Ellis → United Aggregates Inc → United Aggregates Inc.**

- 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:** D. H. Bowman & Son Inc. → United Aggregates Inc.; 1950-01-01 to 2011-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Bowman Richard D → United Aggregates Inc.; 1950-01-01 to 2002-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Bowman Richard D → D. H. Bowman & Son Inc.; 1950-01-01 to 2002-11-03; source msha-controller-operator-history
- **controller_controls_mine:** John D  Ellis et al → United Aggregates Inc.; 1994-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John D  Ellis et al → United Aggregates Inc.; 2002-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Ellis et al → D. H. Bowman & Son Inc.; 2002-11-04 to 2011-12-13; source msha-controller-operator-history
- **operator_operates_mine:** United Aggregates Inc → United Aggregates Inc.; 2011-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Ellis et al → United Aggregates Inc; 2011-12-14 to current/open; source msha-controller-operator-history