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Help with brass Japanese range devices? Computer?

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Can anyone help me with these? I have no clue what they are and wouldn't mind trying to sell them, but would love to know what they are for my own curiosity. They are quite heavy and somewhat large. Any help would be great. Thanks!!


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They look like artillery trajectory charts.


I think that's right. Has "Type 88, 70 mm Field Anti Aircraft Cannon, High Angle Fan Shape Plate" written adjacent to serial no 1808.

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