# Relationship history for MSHA mine 1509403

Current hierarchy: **Sparks Carl E → B-Cde Coal Company 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

- **controller_controls_mine:** Neace Donald → No 1 Mine; 1974-07-23 to 1977-07-11; source msha-controller-operator-history
- **operator_operates_mine:** A B C Coal Corp → No 1 Mine; 1975-12-10 to 1977-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Neace Donald → A B C Coal Corp; 1975-12-10 to 1977-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Jessica Mining Inc → No 1 Mine; 1977-07-12 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Helton Dewey → No 1 Mine; 1977-07-12 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Helton Dewey → Jessica Mining Inc; 1977-07-12 to 1978-08-31; source msha-controller-operator-history
- **operator_operates_mine:** B-Cde Coal Company Inc → No 1 Mine; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sparks Carl E → No 1 Mine; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sparks Carl E → B-Cde Coal Company Inc; 1978-09-01 to current/open; source msha-controller-operator-history