# Relationship history for MSHA mine 3004055

Current hierarchy: **Harry  Harmer → HARMER CONSTRUCTION → SANDVIK JAW CRUSHER 1886SW12124**

- 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:** Harry  Harmer → SANDVIK JAW CRUSHER 1886SW12124; 1990-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harmer Construction → SANDVIK JAW CRUSHER 1886SW12124; 2020-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry  Harmer → Harmer Construction; 2020-06-04 to current/open; source msha-controller-operator-history