You could leverage a ReplaySubject for that:

EDIT: Different since RxJS 6.x: Note the use of the pipe() method.

class myComponent {
  private destroyed$: ReplaySubject<boolean> = new ReplaySubject(1);

  constructor(
    private serviceA: ServiceA,
    private serviceB: ServiceB,
    private serviceC: ServiceC) {}

  ngOnInit() {
    this.serviceA
      .pipe(takeUntil(this.destroyed$))
      .subscribe(...);
    this.serviceB
      .pipe(takeUntil(this.destroyed$))
      .subscribe(...);
    this.serviceC
      .pipe(takeUntil(this.destroyed$))
      .subscribe(...);
  }

  ngOnDestroy() {
    this.destroyed$.next(true);
    this.destroyed$.complete();
  }
}

let timer = IntervalObservable.create(60000);
this.subscription = timer.subscribe(

=======>
import {interval} from 'rxjs';
import {takeWhile} from 'rxjs/operators';
....
interval(60000).pipe(takeWhile(()=>this.alive).subscribe(

https://stackoverflow.com/questions/51688768/migration-from-rxjs-5-to-6-intervalobservable