# Relationship history for MSHA mine 2902231

Current hierarchy: **David  Williams → Rammsco Operations Inc. → Eagle Mesa Mine**

- 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:** Rammsco Inc. → Eagle Mesa Mine; 2001-12-27 to 2009-04-16; source msha-controller-operator-history
- **controller_controls_mine:** David  Williams → Eagle Mesa Mine; 2001-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Williams → Rammsco Inc.; 2001-12-27 to 2009-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Rammsco Operations Inc. → Eagle Mesa Mine; 2009-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Williams → Eagle Mesa Mine; 2009-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Williams → Rammsco Operations Inc.; 2009-04-17 to current/open; source msha-controller-operator-history