# Relationship history for MSHA mine 1101248

Current hierarchy: **Bernard  Krumholz → Bernard Krumholz Inc → Quast 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:** John Keller & Son Inc → Quast Pit; 1950-01-01 to 1983-04-25; source msha-controller-operator-history
- **controller_controls_mine:** John  Keller → Quast Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Keller → John Keller & Son Inc; 1950-01-01 to 1983-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Eureka Sand & Gravel Inc → Quast Pit; 1983-04-26 to 1993-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Veatch → Quast Pit; 1983-04-26 to 1993-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Veatch → Eureka Sand & Gravel Inc; 1983-04-26 to 1993-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Eureka Materials Company → Quast Pit; 1993-08-17 to 1997-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Joseph A  Scharf et al → Quast Pit; 1993-08-17 to 1997-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Joseph A  Scharf et al → Eureka Materials Company; 1993-08-17 to 1997-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Bernard Krumholz Inc → Quast Pit; 1997-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bernard  Krumholz et al → Quast Pit; 1997-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernard  Krumholz et al → Bernard Krumholz Inc; 1997-12-01 to current/open; source msha-controller-operator-history