# Relationship history for MSHA mine 3100794

Current hierarchy: **William D Kelly Sr → Kelly Sand Company Inc → Harnett County Pits**

- 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:** Hancock Sand Company → Harnett County Pits; 1950-01-01 to 1981-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Frances B  Hancock → Harnett County Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frances B  Hancock → Hancock Sand Company; 1950-01-01 to 1981-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Kelly Sand Company Inc → Harnett County Pits; 1981-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William D Kelly Sr → Harnett County Pits; 1981-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William D Kelly Sr → Kelly Sand Company Inc; 1981-02-05 to current/open; source msha-controller-operator-history