# Relationship history for MSHA mine 2400936

Current hierarchy: **Tom  Konitz → Konitz Contracting Inc → KONITZ PORTABLE CRUSHER #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

- **operator_operates_mine:** Francis Tindall Construction → KONITZ PORTABLE CRUSHER #1; 1950-01-01 to 1982-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Francis  Tindall → KONITZ PORTABLE CRUSHER #1; 1950-01-01 to 1982-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Francis  Tindall → Francis Tindall Construction; 1950-01-01 to 1982-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Konitz Contracting Inc → KONITZ PORTABLE CRUSHER #1; 1982-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Konitz et al → KONITZ PORTABLE CRUSHER #1; 1982-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Konitz et al → Konitz Contracting Inc; 1982-09-24 to current/open; source msha-controller-operator-history