# Relationship history for MSHA mine 3301438

Current hierarchy: **CRH PLC → Shelly Materials Inc → SHELLY MATERIALS INC DRESDEN PL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Shelly Company → SHELLY MATERIALS INC DRESDEN PL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cox Gravel Company Inc → SHELLY MATERIALS INC DRESDEN PL; 1950-01-01 to 1991-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Cox Jr → SHELLY MATERIALS INC DRESDEN PL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Cox Jr → Cox Gravel Company Inc; 1950-01-01 to 1991-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → SHELLY MATERIALS INC DRESDEN PL; 1991-09-23 to 2000-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Shelly Company → Shelly Materials Inc; 1991-09-23 to 2000-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → SHELLY MATERIALS INC DRESDEN PL; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → SHELLY MATERIALS INC DRESDEN PL; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Shelly Materials Inc; 2000-03-01 to current/open; source msha-controller-operator-history