# Relationship history for MSHA mine 1505284

Current hierarchy: **Myers Richard → Comy Company → Comy Dock**

- 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:** Comy Company → Comy Dock; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Corum Otto → Comy Dock; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Corum Otto → Comy Company; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Comy Company → Comy Dock; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Myers Richard → Comy Dock; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Myers Richard → Comy Company; 1976-01-01 to current/open; source msha-controller-operator-history