# Relationship history for MSHA mine 4104426

Current hierarchy: **John D  Ramming → RTI Materials → RTI Materials**

- 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:** Priscilla  Yearwood → RTI Materials; 1996-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hwy 195 Crushed Stone Inc. → RTI Materials; 2003-05-29 to 2004-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Priscilla  Yearwood → Hwy 195 Crushed Stone Inc.; 2003-05-29 to 2004-05-02; source msha-controller-operator-history
- **operator_operates_mine:** RTI Materials → RTI Materials; 2004-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John D  Ramming → RTI Materials; 2004-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Ramming → RTI Materials; 2004-05-03 to current/open; source msha-controller-operator-history