Assertion: pinball's game | /r/HasProperty | periscope
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Source sentences:
text: The first seven products were a fortune-telling machine called Selector Scope (1944), two electro-mechanical (EM) games, Periscope (1944) and Liberator (1944), a novelty called Zingo (1944), a pinball conversion called Flat-Top (1945), another EM arcade game, Circus Romance (7/45) and a second pinball conversion called Laura (1945).