happy labour day 1 may. hand holding a tool show up. engineering concept with screwdriver wrench ruler vernier caliper

abour agenda american background banner bar business caliper celebration cheater communist concept congratulate construction contractor country day design employers employment engineering flat flyer freedom greeting hand happy holding holiday illustration industry international key label labour may mechanism national occupation organize pipe poster power race repair revolution ruler screwdriver show socialism spanner steel sticker symbol technical together tool usa vernier victory workers working wrench