# Relationship history for MSHA mine 1516885

Current hierarchy: **Sloan Curtis & David Belcher → Old South Mining Corp → Rf 4**

- 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:** Susie A  Smith et al → Rf 4; 1979-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sloan Curtis & David Belcher → Rf 4; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amy Bartley → Rf 4; 1989-10-01 to 1993-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Amy Coal Inc → Rf 4; 1990-05-01 to 1993-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Amy Bartley → Amy Coal Inc; 1990-05-01 to 1993-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Kyn Coal Company Inc → Rf 4; 1993-11-09 to 1994-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Susie A  Smith et al → Kyn Coal Company Inc; 1993-11-09 to 1994-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Elmer  Fuller et al → Kyn Coal Company Inc; 1993-11-09 to 1994-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Old South Mining Corp → Rf 4; 1994-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sloan Curtis & David Belcher → Old South Mining Corp; 1994-02-28 to current/open; source msha-controller-operator-history