# Relationship history for MSHA mine 1510588

Current hierarchy: **Bradford Virgil → E & B Energy Inc → No 1 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:** Ivy Mining Corp → No 1 Mine; 1977-07-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Graham John W & L D → No 1 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graham John W & L D → Ivy Mining Corp; 1977-07-01 to 1977-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Little John Coal Corp → No 1 Mine; 1977-11-01 to 1979-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Elkins John A → No 1 Mine; 1977-11-01 to 1980-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Elkins John A → Little John Coal Corp; 1977-11-01 to 1979-07-31; source msha-controller-operator-history
- **operator_operates_mine:** E & B Energy Inc → No 1 Mine; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bradford Virgil → No 1 Mine; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradford Virgil → E & B Energy Inc; 1979-08-01 to current/open; source msha-controller-operator-history