# Relationship history for MSHA mine 1517019

Current hierarchy: **Florida Progress Corporation → Diamond May Coal Company Inc → Stoker 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

- **controller_controls_mine:** Florida Progress Corporation → Stoker Tipple; 1989-02-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Diamond May Coal Company Inc → Stoker Tipple; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Diamond May Coal Company Inc; 1990-11-01 to current/open; source msha-controller-operator-history