Japanese Spark Keys

 

(Click on the pictures below to see larger versions of the photo)

 

Japanese spark key by Annaka Electrical. Annaka started in 1900 and changed their name to Anritsu in 1931.

 

 

 

Another marble-based spark key. This one was made by Nanao Musen Denki.

 

 

 

Phenolic based spark key with large contacts. Maker unknown.

 

 

 

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