# Relationship history for MSHA mine 1400540

Current hierarchy: **Lenora R  Stone; James N  Stone Jr → Stone Sand Co., Inc. → JNS**

- 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:** Stone Sand Company → JNS; 1950-01-01 to 2005-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Lenora  Stone → JNS; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lenora  Stone → Stone Sand Company; 1950-01-01 to 2005-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Stone Sand Co., Inc. → JNS; 2005-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lenora R  Stone et al → JNS; 2005-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lenora R  Stone et al → Stone Sand Co., Inc.; 2005-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James N  Stone Jr et al → Stone Sand Co., Inc.; 2005-09-12 to current/open; source msha-controller-operator-history