# Relationship history for MSHA mine 4202331

Current hierarchy: **CCI  (Clyde Companies Inc) → Geneva Rock Products Inc → Portable #1 - South Grantsville Pit**

- 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:** CCI  (Clyde Companies Inc) → Portable #1 - South Grantsville Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dena  Christensen → Portable #1 - South Grantsville Pit; 1983-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Christensen Const & Gravel, Inc → Portable #1 - South Grantsville Pit; 2001-09-27 to 2007-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Dena  Christensen → Christensen Const & Gravel, Inc; 2001-09-27 to 2007-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Geneva Rock Products Inc → Portable #1 - South Grantsville Pit; 2007-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CCI  (Clyde Companies Inc) → Geneva Rock Products Inc; 2007-10-20 to current/open; source msha-controller-operator-history