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Circular No.101C dial slide rule with sythetic leather case and instructions

1965-70

NASA 136MC Ambiguity Resolver circular slide rule 12-inch

1965-1970

Pickett slide rule, model N-16-ES, with electronics scales designed by Chan Street, Los Angeles, in leather carry case

Pickett slide rule

Circular slide rule by Pickett, metal and plastic, in leather pouch with instruction booklet

Circular slide rule by Pickett