# Relationship history for MSHA mine 3303912

Current hierarchy: **Schrader Lloyd → N A L D Construction Inc → Brad 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:** Bask Coal Inc → Brad Mine; 1982-09-01 to 1988-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Mansfield Floyd B → Brad Mine; 1982-09-01 to 1988-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Mansfield Floyd B → Bask Coal Inc; 1982-09-01 to 1988-02-02; source msha-controller-operator-history
- **operator_operates_mine:** N A L D Construction Inc → Brad Mine; 1988-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schrader Lloyd Et Al → Brad Mine; 1988-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schrader Lloyd Et Al → N A L D Construction Inc; 1988-02-03 to current/open; source msha-controller-operator-history