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Founded in 1973 MARUWA CO. LTD is a Japanese manufacturer of ceramic components.

It's production profile is focused on four groups of products: EMC components, radio frequency (RF) products, circuit ceramics and machinery ceramics.

 - Multilayer chip varistors
 - Multilayer ceramic capacitors
 - DIP type multilayer ceramic capacitors
 - Power inductors
 - Chip type EMI filters
 - Chip type feed through EMI filters
 - Chip beads
 - Feed through ceramic capacitors
 - Screw type EMI filters
 - Complex style EMI filters
 - Voltage Controlled Oscillators
 - Band pass filters