Unprepared for war and equipped with obsolete weapons and equipment, the Dutch were rolled over in a few weeks.
The main rifle was the obsolete 6.5mm Mannlicher M1895 turnbolt, which came in a long rifle & several carbine versions:
The 6.5mm ammunition itself had been obsolete since the introduction of the spitzer (pointed) bullet in the 1st decade of the 20th century.
Their machine guns were also obsolete - the Madsen in 6.5mm (similar to this one):
The Lewis M20 in 6.5mm:
The Schwarzlose in 7.92x57R:
The Vickers in 7.92x57R and .303":
The Maxim in 7.92x57R:
Their aircraft were Fokker designs (Fokker was a Dutchman, not a German, although his name is usually associated with them due to their adoption of many of his WW1 biplane designs), and all were obsolete in 1940:
Fokker C.V observation / light bomber:
Fokker C.X observation / light bomber:
Fokker D.XVII fighter:
Fokker D.XXI fighter (note the fixed undercarriage), armed with an unimpressive 2 7.9mm FN machineguns:
Fokker C.1 “fighter-cruiser” (jachtkruiser), a similar concept to the Bf110:
As for “tanks”, this is it:
It did have a 37mm semi-auto Bofors cannon at a time when 20mm in tanks were common, although there were only 26 of these vehicles in total for a country of 16,000 square miles. Armour was 9mm on the turret & 5mm on the rest.
They also had some old Vickers Cardon-Lloyd vehicles, which are similar to the Bren gun carrier:
In effect, the Dutch did not have a hope in hell of holding back the Germans - they did well to last as long as they did.
Most of the images are from http://www.grebbeberg.nl/bibliotheek/bewapening/