# Relationship history for MSHA mine 3303977

Current hierarchy: **Robinson Danny-Kevin & John W → Robinson & Sons Mining → Robinson Mine**

- 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:** Robinson & Sons Mining → Robinson Mine; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robinson Danny-Kevin & John W → Robinson Mine; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robinson Danny-Kevin & John W → Robinson & Sons Mining; 1984-07-01 to current/open; source msha-controller-operator-history