# Relationship history for MSHA mine 0502964

Current hierarchy: **Switzler Jack → Switzler Mining Company → Echo #2**

- 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:** Mike Greagor → Echo #2; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Greagor Mike → Echo #2; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Greagor Mike → Mike Greagor; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Switzler Mining Company → Echo #2; 1979-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Switzler Jack → Echo #2; 1979-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Switzler Jack → Switzler Mining Company; 1979-04-10 to current/open; source msha-controller-operator-history