# Relationship history for MSHA mine 3900994

Current hierarchy: **Roy  Stolpman → Roy Stolpman → Stolpman Pit #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:** W J Stolpman → Stolpman Pit #2; 1950-01-01 to 1984-07-19; source msha-controller-operator-history
- **controller_controls_mine:** W J  Stolpman → Stolpman Pit #2; 1950-01-01 to 1984-07-19; source msha-controller-operator-history
- **controller_controls_operator:** W J  Stolpman → W J Stolpman; 1950-01-01 to 1984-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Roy Stolpman → Stolpman Pit #2; 1984-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Stolpman → Stolpman Pit #2; 1984-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Stolpman → Roy Stolpman; 1984-07-20 to current/open; source msha-controller-operator-history