# Relationship history for MSHA mine 1515576

Current hierarchy: **Goff Sammy → Letchco Fuel Corp → #1 Tipple**

- 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

- **operator_operates_mine:** Shumate & Associates Inc → #1 Tipple; 1986-04-01 to 1986-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Shumate Ford Jr → #1 Tipple; 1986-04-01 to 1986-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Shumate Ford Jr → Shumate & Associates Inc; 1986-04-01 to 1986-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Letchco Fuel Corp → #1 Tipple; 1986-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Goff Sammy → #1 Tipple; 1986-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Goff Sammy → Letchco Fuel Corp; 1986-09-16 to current/open; source msha-controller-operator-history