# Relationship history for MSHA mine 4605698

Current hierarchy: **Hoffman R D → S & K Corp → Leatherwood No 1 Surface**

- 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:** Shafer Thomas → Leatherwood No 1 Surface; 1977-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & K Corp → Leatherwood No 1 Surface; 1977-12-01 to 1980-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Shafer Thomas → S & K Corp; 1977-12-01 to 1980-03-30; source msha-controller-operator-history
- **operator_operates_mine:** S & K Corp → Leatherwood No 1 Surface; 1980-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hoffman R D → Leatherwood No 1 Surface; 1980-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoffman R D → S & K Corp; 1980-03-31 to current/open; source msha-controller-operator-history