# Relationship history for MSHA mine 3605920

Current hierarchy: **Kristoff James J--John J Matukewicz → K M H Mining → Milford Mine**

- 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:** West Gate Mobile Homes → Milford Mine; 1975-12-01 to 1977-07-04; source msha-controller-operator-history
- **controller_controls_mine:** Gagliardi Nicholas → Milford Mine; 1975-12-01 to 1977-07-04; source msha-controller-operator-history
- **controller_controls_operator:** Gagliardi Nicholas → West Gate Mobile Homes; 1975-12-01 to 1977-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Westgate Mobile Homes → Milford Mine; 1977-07-05 to 1979-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Olander Rex → Milford Mine; 1977-07-05 to 1979-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Olander Rex → Westgate Mobile Homes; 1977-07-05 to 1979-10-28; source msha-controller-operator-history
- **operator_operates_mine:** K M H Mining → Milford Mine; 1979-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kristoff James J--John J Matukewicz Et Al → Milford Mine; 1979-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kristoff James J--John J Matukewicz Et Al → K M H Mining; 1979-10-29 to current/open; source msha-controller-operator-history