# Relationship history for MSHA mine 3400530

Current hierarchy: **James A  Kemp; Melinda S  Kemp → Pryor Stone Inc → Pryor Stone #2**

- 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

- **operator_operates_mine:** Pryor Stone Inc → Pryor Stone #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Melinda S  Kemp et al → Pryor Stone #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melinda S  Kemp et al → Pryor Stone Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Kemp et al → Pryor Stone Inc; 1950-01-01 to current/open; source msha-controller-operator-history