# Relationship history for MSHA mine 4201957

Current hierarchy: **Leland J  Mascaro; Sheri D  Mascaro → L J Mascaro Inc → L J MASCARO PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** L J Mascaro Inc → L J MASCARO PIT; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sheri D  Mascaro et al → L J MASCARO PIT; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sheri D  Mascaro et al → L J Mascaro Inc; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leland J  Mascaro et al → L J Mascaro Inc; 1985-09-01 to current/open; source msha-controller-operator-history