# Relationship history for MSHA mine 4503800

Current hierarchy: **Michael C Gilliardi; William M Gilliardi; Paulette J Gilliardi → Gilliardi Logging and Construction Inc. → Portable 1**

- 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:** Michael C Gilliardi et al → Portable 1; 2019-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilliardi Logging and Construction Inc. → Portable 1; 2020-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael C Gilliardi et al → Gilliardi Logging and Construction Inc.; 2020-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William M Gilliardi et al → Gilliardi Logging and Construction Inc.; 2020-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paulette J Gilliardi et al → Gilliardi Logging and Construction Inc.; 2020-02-24 to current/open; source msha-controller-operator-history