# Relationship history for MSHA mine 1700678

Current hierarchy: **Carl J  Soderberg → SODERBERG CO., INC. → Portable Plant #1**

- 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:** Castonguay Gravel → Portable Plant #1; 2000-08-01 to 2003-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Ricky D  Castonguay → Portable Plant #1; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky D  Castonguay → Castonguay Gravel; 2000-08-01 to 2003-09-22; source msha-controller-operator-history
- **operator_operates_mine:** SODERBERG CO., INC. → Portable Plant #1; 2003-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl J  Soderberg → Portable Plant #1; 2003-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl J  Soderberg → SODERBERG CO., INC.; 2003-09-23 to current/open; source msha-controller-operator-history