# Relationship history for MSHA mine 3402010

Current hierarchy: **James A  Kemp; Melinda S  Kemp → Kemp Stone, Inc. → Hulbert**

- 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:** Melinda S  Kemp et al → Hulbert; 1985-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kemp Stone, Inc. → Hulbert; 2006-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melinda S  Kemp et al → Kemp Stone, Inc.; 2006-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Kemp et al → Kemp Stone, Inc.; 2006-05-04 to current/open; source msha-controller-operator-history