# Relationship history for MSHA mine 3402140

Current hierarchy: **James A  Kemp; Melinda S  Kemp → PRYOR STONE INC → ROCK CREEK**

- 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:** James A  Kemp et al → ROCK CREEK; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** PRYOR STONE INC → ROCK CREEK; 2014-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Kemp et al → PRYOR STONE INC; 2014-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melinda S  Kemp et al → PRYOR STONE INC; 2014-01-27 to current/open; source msha-controller-operator-history