# Relationship history for MSHA mine 1512728

Current hierarchy: **Salmons Carlos → C & R Coal Company → No 2 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:** Salmons Carlos → No 2 Mine; 1980-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burgess David → No 2 Mine; 1981-01-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L M B River Coal Company Inc → No 2 Mine; 1981-02-01 to 1982-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Burgess David → L M B River Coal Company Inc; 1981-02-01 to 1982-04-05; source msha-controller-operator-history
- **operator_operates_mine:** C & R Coal Company → No 2 Mine; 1982-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salmons Carlos → C & R Coal Company; 1982-04-06 to current/open; source msha-controller-operator-history