# Relationship history for MSHA mine 3607577

Current hierarchy: **Kear Gordon D → H A Enterprises Inc → Pifer**

- 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:** Kear Gordon D → Pifer; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H A Enterprises Inc → Pifer; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kear Gordon D → H A Enterprises Inc; 1984-05-01 to current/open; source msha-controller-operator-history