# Relationship history for MSHA mine 0101916

Current hierarchy: **Rigsby Gerald → Contract Mining Inc → Manchester Strip**

- 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:** Rigsby Gerald → Manchester Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Contract Mining Inc → Manchester Strip; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rigsby Gerald → Contract Mining Inc; 1978-09-01 to current/open; source msha-controller-operator-history