# Relationship history for MSHA mine 1516865

Current hierarchy: **N S C Corp; Sibo Services Inc → Nugent Sand Company → Louisville Yard**

- 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:** William J Cannon Trust → Louisville Yard; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** N S C Corp et al → Louisville Yard; 1984-07-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nugent Sand Company Inc → Louisville Yard; 1990-04-01 to 1990-09-30; source msha-controller-operator-history
- **controller_controls_operator:** William J Cannon Trust → Nugent Sand Company Inc; 1990-04-01 to 1990-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Nugent Sand Company → Louisville Yard; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** N S C Corp et al → Nugent Sand Company; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sibo Services Inc et al → Nugent Sand Company; 1990-10-01 to current/open; source msha-controller-operator-history