# Relationship history for MSHA mine 1103027

Current hierarchy: **Helm Group Inc → Conmat Inc., dba Helm Materials → Spread 5**

- 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:** Helm Group Inc → Spread 5; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Loberg Excavating Inc → Spread 5; 1998-01-01 to 2010-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Loberg → Spread 5; 1998-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Loberg → Loberg Excavating Inc; 1998-01-01 to 2010-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Conmat Inc., dba Helm Materials → Spread 5; 2010-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Helm Group Inc → Conmat Inc., dba Helm Materials; 2010-07-20 to current/open; source msha-controller-operator-history