American Educational Products 913-PS Wave Maker - Black/Grey - Columbia Pictures That might be just enough

That might be just enough to deter someone from going any further

The ball is covered with division problems

Year: 1937

Versatile floor finish that provides extreme durability and long-lasting gloss with high-speed maintenance procedures|Designed for medium-frequency maintenance and high-speed equipment and features a 20% versatile high gloss finish with excellent durability

Stanley confirms

American Educational Products 913-PS Wave Maker - Black/Grey - Columbia Pictures That might be just enoughAmerican Educational Products 913 PS Wave Maker Black Grey Features An excellent addition to your science classroom or laboratory Economically priced to fit your classroom budget Battery operated machine eliminates the need for an outside power source Grade Level: Middle High School Material: Plastic Styrene WARNING: CHOKING HAZARD Small parts. Not for children under 3 yrs.