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The Wrench, your trusty weapon in the original BioShock can be found in BioShock Infinite. It's located just after aquiring the "Murder of Crows" Vigor; right next to a gear piece you can collect.

not really an easter egg, as it is everywhere in the game, it is also on the First Lady Blimp when he shoves it aside when taking the controls.

*SPOILER WARNING*
Also when Elizabeth knocks out Booker she used the wrench. I think it would be an Easter egg due to it being placed in the game for a reason.