# Relationship history for MSHA mine 1515991

Current hierarchy: **(Donald) Todd  Kiscaden; Scott  Kiscaden → K T K Mining & Construction Inc → No 4 Surface**

- 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:** Jackson Donald & Arlon Et Al → No 4 Surface; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Kiscaden et al → No 4 Surface; 1986-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jackson & Jackson Coal Company Inc → No 4 Surface; 1987-04-01 to 1988-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Donald & Arlon Et Al → Jackson & Jackson Coal Company Inc; 1987-04-01 to 1988-03-01; source msha-controller-operator-history
- **operator_operates_mine:** K T K Mining & Construction Inc → No 4 Surface; 1988-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Kiscaden et al → K T K Mining & Construction Inc; 1988-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** (Donald) Todd  Kiscaden et al → K T K Mining & Construction Inc; 1988-03-02 to current/open; source msha-controller-operator-history