Abstract
Out of the three SNRs G291.0 - 0.1, G308.7 + 0.0, and G328.4 + 0.2, which resemble the Crab Nebula in many of their radio properties, the present Einstein Observatory search was able to detect only the first, which is noted to have very extended X-ray emission with strong central brightening. Given the large distances and hydrogen column densities of the other two SNRs, their X-ray limits are consistent with membership in the Crab Nebula-like group. The evolutions of radio luminosity, X-ray luminosity, and the ratio of the two luminosities with remnant diameter are reassessed for this SNR class. No evidence is found for a radio luminosity decrease with diameter (age).
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