# Relationship history for MSHA mine 3301548

Current hierarchy: **Bill  Sheckler → National Aggregates Inc → National Aggregates Incorporated**

- 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:** Fuel Savers Inc → National Aggregates Incorporated; 1950-01-01 to 1986-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Furey Daniel J → National Aggregates Incorporated; 1950-01-01 to 1986-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Furey Daniel J → Fuel Savers Inc; 1950-01-01 to 1986-02-25; source msha-controller-operator-history
- **operator_operates_mine:** National Aggregates Inc → National Aggregates Incorporated; 1986-02-26 to 1988-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Gioffre Carl → National Aggregates Incorporated; 1986-02-26 to 1988-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Gioffre Carl → National Aggregates Inc; 1986-02-26 to 1988-03-24; source msha-controller-operator-history
- **operator_operates_mine:** National Aggregates Inc → National Aggregates Incorporated; 1988-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Sheckler → National Aggregates Incorporated; 1988-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Sheckler → National Aggregates Inc; 1988-03-25 to current/open; source msha-controller-operator-history