# Relationship history for MSHA mine 0101907

Current hierarchy: **Rice Donald R-A J Richards → Southern Natural Energy Corp → West Corona 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

- **operator_operates_mine:** Southern Natural Energy Corp → West Corona Strip; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rice Donald R-A J Richards Et Al → West Corona Strip; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rice Donald R-A J Richards Et Al → Southern Natural Energy Corp; 1978-07-01 to current/open; source msha-controller-operator-history