# Relationship history for MSHA mine 0404407

Current hierarchy: **Shirley  Gundlach → S & A Development Company Inc → Greenhorn Creek Or Greenhorn**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Shirley  Gundlach → Greenhorn Creek Or Greenhorn; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & A Development Company Inc → Greenhorn Creek Or Greenhorn; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley  Gundlach → S & A Development Company Inc; 1980-01-01 to current/open; source msha-controller-operator-history