Does anyone know the purpose of these tools?

[Francisco Motta, Afinador de Pianos]

FOR ALL: 
Does anyone know the purpose of these tools? 
They are made of sheet steel with 0.60mm. The largest is 81mm in length and the smallest 55mm. 
The first impression is that this is a model for the bridges construction. 
Who has ever seen or used? 
Thankful. 
Francisco Motta 
Belo Horizonte-MG 
Brazil
.
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