Spanish

MS-004

MS-004

Four maritime keys, from left to right:

Deluxe Stream Key manufactured by Dentsu Seiki Co.Tokyo, Japan.

Model HK-1S  Swallow, with silver contacts 6 mm. in diameter.

This company later become known as  Hi-Mound.

Hi-Mound key, Model  HK 703

Hi-Mound key, Model HK 704.

I understand the last two used on board of ships, but could have been in operation somewhere else.

Polish key (?) found on board of fishing vessel at the breakers´ yard.

No markings found except in the plug (Made in Poland).

Russian key found on board of fishing vessel at the breakers´ yard.

The base contains an array of coils, resistances and capacitors, with

four terminals at the back.