# Relationship history for MSHA mine 0102853

Current hierarchy: **Morin Steve & Morton Claxton → H M C Bridge Company → Blue Creek**

- 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:** Hobson Jimmy → Blue Creek; 1988-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Signa Mining Inc → Blue Creek; 1990-03-01 to 1990-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Hobson Jimmy → Signa Mining Inc; 1990-03-01 to 1990-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Sure Coal Inc → Blue Creek; 1990-06-14 to 1991-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Ramona H → Blue Creek; 1990-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Ramona H → Sure Coal Inc; 1990-06-14 to 1991-06-09; source msha-controller-operator-history
- **operator_operates_mine:** H M C Bridge Company → Blue Creek; 1991-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morin Steve & Morton Claxton Et Al → Blue Creek; 1991-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morin Steve & Morton Claxton Et Al → H M C Bridge Company; 1991-06-10 to current/open; source msha-controller-operator-history