# Relationship history for MSHA mine 1516086

Current hierarchy: **Richard E  Salyer → Kilowatt Coal Company Inc → D-2**

- 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:** Sloan Curtis & David Belcher → D-2; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Salyer et al → D-2; 1987-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Old South Mining Corp → D-2; 1987-06-01 to 1988-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Sloan Curtis & David Belcher → Old South Mining Corp; 1987-06-01 to 1988-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Kilowatt Coal Company Inc → D-2; 1988-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Salyer et al → Kilowatt Coal Company Inc; 1988-07-25 to current/open; source msha-controller-operator-history