# Relationship history for MSHA mine 3100403

Current hierarchy: **Danny L  Rice → Asheville Bumcombe Sand Company → Harmony Mine & Mill**

- 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:** Asheville Sand Company → Harmony Mine & Mill; 1950-01-01 to 1988-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Byrd Jay → Harmony Mine & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Byrd Jay → Asheville Sand Company; 1950-01-01 to 1988-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Asheville Bumcombe Sand Company → Harmony Mine & Mill; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Danny L  Rice et al → Harmony Mine & Mill; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danny L  Rice et al → Asheville Bumcombe Sand Company; 1988-11-01 to current/open; source msha-controller-operator-history