# Relationship history for MSHA mine 1000349

Current hierarchy: **U S Aggregate Inc → Monroc Inc → #2154 WASH 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

- **operator_operates_mine:** Monroc Inc → #2154 WASH PLANT; 1950-01-01 to 1988-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Wel-Com Financial Services & M-K Holding Corp → #2154 WASH PLANT; 1950-01-01 to 2000-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Wel-Com Financial Services & M-K Holding Corp → Monroc Inc; 1950-01-01 to 1988-10-06; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → #2154 WASH PLANT; 1986-06-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Monroc Inc → #2154 WASH PLANT; 1988-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → Monroc Inc; 1988-10-07 to current/open; source msha-controller-operator-history