# Relationship history for MSHA mine 4605827

Current hierarchy: **Icenhour Charles → I & S Coal Company Inc → Springton 93-78 (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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Icenhour Charles → Springton 93-78 (Surface); 1974-05-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Daries Coal Corp → Springton 93-78 (Surface); 1978-08-01 to 1979-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Mc Daries H C → Springton 93-78 (Surface); 1978-08-01 to 1979-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Mc Daries H C → Mc Daries Coal Corp; 1978-08-01 to 1979-05-07; source msha-controller-operator-history
- **operator_operates_mine:** I & S Coal Company Inc → Springton 93-78 (Surface); 1979-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Icenhour Charles → I & S Coal Company Inc; 1979-05-08 to current/open; source msha-controller-operator-history